Warning specifying future change in to_tf_dataset behaviour

Warning specifying future changes happening to `to_tf_dataset` behaviour when #5602 is merged in

Comments:
_The documentation is not available anymore as the PR was closed or merged._

<details>
<summary>Show benchmarks</summary>

PyArrow==8.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.006693 / 0.011353 (-0.004660) | 0.004586 / 0.011008 (-0.006422) | 0.097238 / 0.038508 (0.058730) | 0.027912 / 0.023109 (0.004802) | 0.347339 / 0.275898 (0.071441) | 0.393847 / 0.323480 (0.070368) | 0.005105 / 0.007986 (-0.002880) | 0.004750 / 0.004328 (0.000422) | 0.074671 / 0.004250 (0.070421) | 0.037912 / 0.037052 (0.000860) | 0.368973 / 0.258489 (0.110483) | 0.403983 / 0.293841 (0.110142) | 0.030817 / 0.128546 (-0.097730) | 0.011813 / 0.075646 (-0.063833) | 0.324470 / 0.419271 (-0.094802) | 0.044232 / 0.043533 (0.000699) | 0.347623 / 0.255139 (0.092484) | 0.382458 / 0.283200 (0.099259) | 0.086603 / 0.141683 (-0.055080) | 1.485778 / 1.452155 (0.033623) | 1.549776 / 1.492716 (0.057059) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.200154 / 0.018006 (0.182147) | 0.440645 / 0.000490 (0.440155) | 0.003664 / 0.000200 (0.003464) | 0.000069 / 0.000054 (0.000015) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023635 / 0.037411 (-0.013776) | 0.094969 / 0.014526 (0.080443) | 0.103630 / 0.176557 (-0.072927) | 0.168655 / 0.737135 (-0.568480) | 0.105850 / 0.296338 (-0.190488) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.425224 / 0.215209 (0.210015) | 4.236618 / 2.077655 (2.158963) | 1.917091 / 1.504120 (0.412971) | 1.746984 / 1.541195 (0.205789) | 1.817766 / 1.468490 (0.349276) | 0.700989 / 4.584777 (-3.883788) | 3.412577 / 3.745712 (-0.333135) | 3.049311 / 5.269862 (-2.220551) | 1.607692 / 4.565676 (-2.957984) | 0.083410 / 0.424275 (-0.340865) | 0.012601 / 0.007607 (0.004994) | 0.528244 / 0.226044 (0.302200) | 5.284134 / 2.268929 (3.015206) | 2.391885 / 55.444624 (-53.052740) | 2.020018 / 6.876477 (-4.856459) | 2.105908 / 2.142072 (-0.036164) | 0.801262 / 4.805227 (-4.003965) | 0.151467 / 6.500664 (-6.349197) | 0.066529 / 0.075469 (-0.008940) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.203894 / 1.841788 (-0.637894) | 13.827561 / 8.074308 (5.753253) | 14.136730 / 10.191392 (3.945338) | 0.143829 / 0.680424 (-0.536595) | 0.016410 / 0.534201 (-0.517791) | 0.378194 / 0.579283 (-0.201089) | 0.391235 / 0.434364 (-0.043129) | 0.439261 / 0.540337 (-0.101076) | 0.527181 / 1.386936 (-0.859755) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.006639 / 0.011353 (-0.004714) | 0.004469 / 0.011008 (-0.006540) | 0.076495 / 0.038508 (0.037987) | 0.027880 / 0.023109 (0.004771) | 0.342807 / 0.275898 (0.066909) | 0.374258 / 0.323480 (0.050778) | 0.005543 / 0.007986 (-0.002443) | 0.003362 / 0.004328 (-0.000966) | 0.075064 / 0.004250 (0.070813) | 0.039209 / 0.037052 (0.002156) | 0.342490 / 0.258489 (0.084001) | 0.382135 / 0.293841 (0.088294) | 0.030356 / 0.128546 (-0.098191) | 0.011762 / 0.075646 (-0.063884) | 0.086031 / 0.419271 (-0.333241) | 0.041991 / 0.043533 (-0.001542) | 0.340323 / 0.255139 (0.085184) | 0.364160 / 0.283200 (0.080961) | 0.088483 / 0.141683 (-0.053200) | 1.502836 / 1.452155 (0.050681) | 1.570438 / 1.492716 (0.077722) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.218486 / 0.018006 (0.200480) | 0.405251 / 0.000490 (0.404761) | 0.000398 / 0.000200 (0.000198) | 0.000062 / 0.000054 (0.000008) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.025738 / 0.037411 (-0.011673) | 0.100390 / 0.014526 (0.085864) | 0.109913 / 0.176557 (-0.066644) | 0.161310 / 0.737135 (-0.575826) | 0.113269 / 0.296338 (-0.183069) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.438083 / 0.215209 (0.222874) | 4.377742 / 2.077655 (2.300087) | 2.069949 / 1.504120 (0.565829) | 1.857807 / 1.541195 (0.316613) | 1.881315 / 1.468490 (0.412825) | 0.695373 / 4.584777 (-3.889404) | 3.440287 / 3.745712 (-0.305425) | 1.842888 / 5.269862 (-3.426973) | 1.146655 / 4.565676 (-3.419022) | 0.083386 / 0.424275 (-0.340889) | 0.012290 / 0.007607 (0.004683) | 0.545672 / 0.226044 (0.319628) | 5.469568 / 2.268929 (3.200639) | 2.511886 / 55.444624 (-52.932739) | 2.184210 / 6.876477 (-4.692267) | 2.329822 / 2.142072 (0.187749) | 0.804114 / 4.805227 (-4.001114) | 0.151651 / 6.500664 (-6.349013) | 0.067269 / 0.075469 (-0.008200) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.272564 / 1.841788 (-0.569223) | 14.180708 / 8.074308 (6.106400) | 14.181657 / 10.191392 (3.990265) | 0.131443 / 0.680424 (-0.548981) | 0.016513 / 0.534201 (-0.517688) | 0.383786 / 0.579283 (-0.195497) | 0.397678 / 0.434364 (-0.036686) | 0.447003 / 0.540337 (-0.093334) | 0.539453 / 1.386936 (-0.847483) |

</details>
</details>

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