chore: fix typos in docs
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<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) | 0.005319 / 0.011353 (-0.006034) | 0.003979 / 0.011008 (-0.007030) | 0.063858 / 0.038508 (0.025350) | 0.031064 / 0.023109 (0.007955) | 0.232761 / 0.275898 (-0.043137) | 0.260362 / 0.323480 (-0.063118) | 0.004271 / 0.007986 (-0.003715) | 0.002801 / 0.004328 (-0.001527) | 0.049471 / 0.004250 (0.045220) | 0.043432 / 0.037052 (0.006379) | 0.247467 / 0.258489 (-0.011022) | 0.271926 / 0.293841 (-0.021915) | 0.030063 / 0.128546 (-0.098483) | 0.012659 / 0.075646 (-0.062988) | 0.204650 / 0.419271 (-0.214622) | 0.036340 / 0.043533 (-0.007192) | 0.237480 / 0.255139 (-0.017659) | 0.255955 / 0.283200 (-0.027244) | 0.017922 / 0.141683 (-0.123761) | 1.152251 / 1.452155 (-0.299904) | 1.195610 / 1.492716 (-0.297106) |

### 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) | 0.095411 / 0.018006 (0.077405) | 0.296836 / 0.000490 (0.296346) | 0.000226 / 0.000200 (0.000026) | 0.000054 / 0.000054 (-0.000001) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018547 / 0.037411 (-0.018865) | 0.063423 / 0.014526 (0.048897) | 0.073587 / 0.176557 (-0.102970) | 0.120327 / 0.737135 (-0.616808) | 0.076185 / 0.296338 (-0.220154) |

### 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) | 0.282815 / 0.215209 (0.067606) | 2.781204 / 2.077655 (0.703549) | 1.432489 / 1.504120 (-0.071631) | 1.312018 / 1.541195 (-0.229177) | 1.328290 / 1.468490 (-0.140200) | 0.734169 / 4.584777 (-3.850608) | 2.380654 / 3.745712 (-1.365058) | 2.904945 / 5.269862 (-2.364916) | 1.872079 / 4.565676 (-2.693598) | 0.078329 / 0.424275 (-0.345946) | 0.005151 / 0.007607 (-0.002457) | 0.338957 / 0.226044 (0.112912) | 3.353638 / 2.268929 (1.084709) | 1.812223 / 55.444624 (-53.632401) | 1.514860 / 6.876477 (-5.361617) | 1.528539 / 2.142072 (-0.613533) | 0.798711 / 4.805227 (-4.006516) | 0.135129 / 6.500664 (-6.365535) | 0.042355 / 0.075469 (-0.033114) |

### 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) | 0.954665 / 1.841788 (-0.887122) | 11.431925 / 8.074308 (3.357617) | 9.652583 / 10.191392 (-0.538809) | 0.132538 / 0.680424 (-0.547886) | 0.015517 / 0.534201 (-0.518683) | 0.303826 / 0.579283 (-0.275457) | 0.267530 / 0.434364 (-0.166834) | 0.340775 / 0.540337 (-0.199562) | 0.429909 / 1.386936 (-0.957027) |

</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) | 0.005819 / 0.011353 (-0.005533) | 0.003829 / 0.011008 (-0.007179) | 0.049707 / 0.038508 (0.011199) | 0.030810 / 0.023109 (0.007701) | 0.269637 / 0.275898 (-0.006261) | 0.295857 / 0.323480 (-0.027623) | 0.004462 / 0.007986 (-0.003523) | 0.002823 / 0.004328 (-0.001505) | 0.048544 / 0.004250 (0.044294) | 0.039692 / 0.037052 (0.002639) | 0.286837 / 0.258489 (0.028348) | 0.319874 / 0.293841 (0.026034) | 0.033319 / 0.128546 (-0.095227) | 0.012318 / 0.075646 (-0.063329) | 0.060319 / 0.419271 (-0.358953) | 0.034341 / 0.043533 (-0.009192) | 0.271132 / 0.255139 (0.015993) | 0.292577 / 0.283200 (0.009377) | 0.018298 / 0.141683 (-0.123384) | 1.136871 / 1.452155 (-0.315284) | 1.192894 / 1.492716 (-0.299822) |

### 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) | 0.098890 / 0.018006 (0.080884) | 0.307830 / 0.000490 (0.307341) | 0.000214 / 0.000200 (0.000014) | 0.000044 / 0.000054 (-0.000010) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023066 / 0.037411 (-0.014346) | 0.076732 / 0.014526 (0.062206) | 0.088154 / 0.176557 (-0.088403) | 0.129849 / 0.737135 (-0.607286) | 0.089368 / 0.296338 (-0.206970) |

### 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) | 0.298298 / 0.215209 (0.083089) | 2.914801 / 2.077655 (0.837147) | 1.609280 / 1.504120 (0.105160) | 1.486971 / 1.541195 (-0.054223) | 1.496254 / 1.468490 (0.027764) | 0.723780 / 4.584777 (-3.860997) | 0.972436 / 3.745712 (-2.773276) | 2.993773 / 5.269862 (-2.276089) | 1.911170 / 4.565676 (-2.654506) | 0.080599 / 0.424275 (-0.343677) | 0.005713 / 0.007607 (-0.001894) | 0.350510 / 0.226044 (0.124465) | 3.464035 / 2.268929 (1.195107) | 2.001558 / 55.444624 (-53.443066) | 1.691888 / 6.876477 (-5.184589) | 1.732348 / 2.142072 (-0.409724) | 0.818572 / 4.805227 (-3.986655) | 0.136770 / 6.500664 (-6.363894) | 0.041722 / 0.075469 (-0.033748) |

### 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) | 1.021225 / 1.841788 (-0.820563) | 11.941224 / 8.074308 (3.866915) | 10.118500 / 10.191392 (-0.072892) | 0.146167 / 0.680424 (-0.534257) | 0.015700 / 0.534201 (-0.518501) | 0.301511 / 0.579283 (-0.277772) | 0.122716 / 0.434364 (-0.311648) | 0.349048 / 0.540337 (-0.191290) | 0.444940 / 1.386936 (-0.941996) |

</details>
</details>

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