DOC: Add more examples for reset_index
State: closed

Expands documentation for `col_fill`.

Follow-up to #16975.

Labels:
name: Docs
name: Indexing
description: Related to indexing on series/frames, not to indexes themselves

Comments:
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=h1) Report
> Merging [#17055](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ee6412aee8bbf350aea89bbafbfdfb0f8d7620ed?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17055/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17055      +/-   ##
==========================================
- Coverage   91.02%      91%   -0.03%     
==========================================
  Files         161      161              
  Lines       49348    49348              
==========================================
- Hits        44921    44911      -10     
- Misses       4427     4437      +10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.78% <ø> (-0.01%)` | :arrow_down: |
| #single | `40.26% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.75% <ø> (-0.1%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `95.23% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=footer). Last update [ee6412a...3d14ff9](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=h1) Report
> Merging [#17055](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ee6412aee8bbf350aea89bbafbfdfb0f8d7620ed?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17055/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17055      +/-   ##
==========================================
- Coverage   91.02%      91%   -0.03%     
==========================================
  Files         161      161              
  Lines       49348    49348              
==========================================
- Hits        44921    44911      -10     
- Misses       4427     4437      +10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.78% <ø> (-0.01%)` | :arrow_down: |
| #single | `40.26% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.75% <ø> (-0.1%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `95.23% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=footer). Last update [ee6412a...3d14ff9](https://codecov.io/gh/pandas-dev/pandas/pull/17055?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

thanks!