DOC: Move whatsnew for indexing regression
xref #47921, https://github.com/pandas-dev/pandas/issues/47867#issuecomment-1198412271

Moves the whatsnew

milestone 1.4.4 but does not need to be backported (@phofl note that sometimes that the release notes go out of sync and need to be corrected)

Do you think we should also add the code sample from #47867 to close that issue? (the test would also be backported so could be a separate PR)  Yes. would do this as a follow up @phofl i'm not sure about #47925 so have resolved the conflict, but if that gets merged we would probably have conflicts here again. urgh I should have left it in otherwise we will get more conflicts if we have to move the release note for that one.

don't merge this yet. although i'm doing something else at the moment (fixing the typing on 1.4.x) so probably won't fix this till tomorrow. No worries, added it back in Thanks. sorry for interfering. I thought it'd be quicker to just resolve the conflicts on the web interface than ping you. No worries. I am doing this in Pycharm anyway, so did not create additional work for me. Thanks for helping Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

```
git checkout 1.4.x
git pull
```

2. Cherry pick the first parent branch of the this PR on top of the older branch:
```
git cherry-pick -x -m1 6e998a6c7c9bb42adb529597d2a12a029f26c297
```

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

```
git commit -am 'Backport PR #47924: DOC: Move whatsnew for indexing regression'
```

4. Push to a named branch:

```
git push YOURFORK 1.4.x:auto-backport-of-pr-47924-on-1.4.x
```

5. Create a PR against branch 1.4.x, I would have named this PR:

> "Backport PR #47924 on branch 1.4.x (DOC: Move whatsnew for indexing regression)"

And apply the correct labels and milestones.

Congratulations — you did some good work! Hopefully your backport PR will be tested by the continuous integration and merged soon!

Remember to remove the `Still Needs Manual Backport` label once the PR gets merged.

If these instructions are inaccurate, feel free to [suggest an improvement](https://github.com/MeeseeksBox/MeeseeksDev).
                 Don't have to backport this