DOC: Stop ignoring fixed rst files in flake8-rst
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Removing from the list of ignored files in flake8-rst, the pages that have been fixed before the ignore list was merged.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24051?src=pr&el=h1) Report
> Merging [#24051](https://codecov.io/gh/pandas-dev/pandas/pull/24051?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/022f458ee858721d366c27dd88940d69383ab960?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/24051/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24051?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24051   +/-   ##
=======================================
  Coverage   92.31%   92.31%           
=======================================
  Files         161      161           
  Lines       51562    51562           
=======================================
  Hits        47599    47599           
  Misses       3963     3963
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.71% <ø> (ø)` | :arrow_up: |
| #single | `42.44% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24051?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/24051?src=pr&el=footer). Last update [022f458...707d823](https://codecov.io/gh/pandas-dev/pandas/pull/24051?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/24051?src=pr&el=h1) Report
> :exclamation: No coverage uploaded for pull request base (`master@92d25f0`). [Click here to learn what that means](https://docs.codecov.io/docs/error-reference#section-missing-base-commit).
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24051/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24051?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##             master   #24051   +/-   ##
=========================================
  Coverage          ?   42.45%           
=========================================
  Files             ?      161           
  Lines             ?    51561           
  Branches          ?        0           
=========================================
  Hits              ?    21888           
  Misses            ?    29673           
  Partials          ?        0
```

| Flag | Coverage Δ | |
|---|---|---|
| #single | `42.45% <ø> (?)` | |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24051?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/24051?src=pr&el=footer). Last update [92d25f0...563007b](https://codecov.io/gh/pandas-dev/pandas/pull/24051?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks for the comments @FHaase, I fixed the remaining issues in `io.rst` and stopped ignoring `timedeltas.rst` @datapythonista can you rebase this. (i merged something else) @jreback this is green now thanks!