DOC: Move 0.23.5 release notes
Closes https://github.com/pandas-dev/pandas/issues/22923
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=h1) Report
> Merging [#24165](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c0b9eea7067d6089fabdc31ac2ed4cc16d063568?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/24165/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24165   +/-   ##
=======================================
  Coverage    92.2%    92.2%           
=======================================
  Files         162      162           
  Lines       51700    51700           
=======================================
  Hits        47669    47669           
  Misses       4031     4031
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.6% <ø> (ø)` | :arrow_up: |
| #single | `43.02% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24165?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/24165?src=pr&el=footer). Last update [c0b9eea...fab8d00](https://codecov.io/gh/pandas-dev/pandas/pull/24165?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/24165?src=pr&el=h1) Report
> Merging [#24165](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c0b9eea7067d6089fabdc31ac2ed4cc16d063568?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/24165/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24165   +/-   ##
=======================================
  Coverage    92.2%    92.2%           
=======================================
  Files         162      162           
  Lines       51700    51700           
=======================================
  Hits        47669    47669           
  Misses       4031     4031
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.6% <ø> (ø)` | :arrow_up: |
| #single | `43.02% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24165?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/24165?src=pr&el=footer). Last update [c0b9eea...fab8d00](https://codecov.io/gh/pandas-dev/pandas/pull/24165?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Thanks @TomAugspurger 

If I'm not wrong, the `IO` section title in bug fixes is missing, and it may make sense to change a bit the listed documentation changes (in some PR was agreed to remove the spelling extension and have that as a separate project, and we could mention all the formatting standardization we're finishing)

I'll propose those changes in a separate PR.