Fix broken indentation of some codeblocks

[Mingun]

Commit 2691644 from #313 has broken some indentation, and my own PR #291 mention the wrong version number since that the repetition operator is available, so I've fixed both problems.

[hildjj]

Sorry that I was sloppy when fixing those up. Once I noticed that there were some wrong, I should have checked all of them.

This also needs to land on stable. I guess I cherry-pick this onto my local stable branch, then do a PR where the target is stable?

[Mingun]

As you wish. Honestly, I managed to forget the workflow that you want to adhere to. Interestingly, when I had making this PR, GitHub reported some strange create PR url which in fact was a compare form instead of a PR making form.

[hildjj]

According to https://stackoverflow.com/questions/45169565/git-applying-changes-to-two-branches, I think the right way to land this is to have this PR be against the docs-feature branch, which I just created. Then we can merge that branch to stable and to main.

[hildjj]

Somehow the stable branch got deleted yesterday, so maybe that's why something was odd. I just recreated at the correct branch point.

And no, I don't know what the right workflow is, but let's try this while the stakes are low.

[hildjj]

I tried resetting the base, but that didn't work cleanly, because it still picked up the CHANGELOG.md change that I want to leave on main. I think you'll need to rebase on your side first.

[Mingun]

Done

[hildjj]

Merged to stable and main. Published to site. Found #352 in the process.