DOC: 0.24.1 whatsnew
This PR has the documentation changes that are just for 0.24.x. I'll have another PR later with changes to 0.24.1.rst that should go to master first, before being backported.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=h1) Report
> Merging [#25027](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=desc) into [0.24.x](https://codecov.io/gh/pandas-dev/pandas/commit/c228597c78978dcada5db260a69f2d3230ee51d9?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25027/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           0.24.x   #25027   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files         166      166           
  Lines       52391    52391           
=======================================
  Hits        48400    48400           
  Misses       3991     3991
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.8% <ø> (ø)` | :arrow_up: |
| #single | `42.88% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25027?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/25027?src=pr&el=footer). Last update [c228597...c71f1bd](https://codecov.io/gh/pandas-dev/pandas/pull/25027?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/25027?src=pr&el=h1) Report
> Merging [#25027](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=desc) into [0.24.x](https://codecov.io/gh/pandas-dev/pandas/commit/c228597c78978dcada5db260a69f2d3230ee51d9?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/25027/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           0.24.x   #25027   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files         166      166           
  Lines       52391    52391           
=======================================
  Hits        48400    48400           
  Misses       3991     3991
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.8% <ø> (ø)` | :arrow_up: |
| #single | `42.88% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/25027?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/25027?src=pr&el=footer). Last update [c228597...c71f1bd](https://codecov.io/gh/pandas-dev/pandas/pull/25027?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Hmm, this is a bit the disadvantage of having the bugfix releases on separate pages, as it would be nice to keep pointing users to the more relevant 0.24.0 whatsnew docs? Or maybe explicitly link to that the 0.24.0 docs in the 0.24.1 release notes alternative, we *could* simply insert the changed *into* the 0.24.0 docs with an annotation, maybe [0.24.1] next to it? Keep in mind that when you're on http://pandas.pydata.org/pandas-docs/stable/whatsnew/v0.24.0.html, you see all the previous releases in the TOC-tree. So you can easily access them already.

Good to merge? lgtm.