Fix incorrect reST indents in docs

[ezio-melotti]

Pull Request

Pull Request Checklist

• Read and followed this repo's Contributing Guidelines
• Based your PR on the latest version of the correct branch (master or 4.x)
• Checked your writing carefully for correct English spelling, grammar, etc
• Described your changes and the motivation for them below
• Noted what issue(s) this pull request resolves, creating one if needed

Description of Changes

Fixes markup errors spotted by:

• Add a checker for excessive indentation. sphinx-contrib/sphinx-lint#87 (see these failures)

cc @CAM-Gerlach

Issue(s) Resolved

[CAM-Gerlach]

I checked each case in the source and rendered output, and that all LGTM.

Could you (or I can, as a commit here) bump the Sphinx-Lint version to the latest 0.7.0 in the .pre-commit-config.yaml so we're actually testing this against the latest Sphinx-Lint with all the checks, and don't have any regressions (which would in turn would make for problems with Sphinx-Lint's "friends" checker). Thanks!

Also, this is blocked on #352 being merged to fix the broken links detected by linkcheck, but I'll have that merged shortly and you can rebase (or merge) it in. Thanks!

[CAM-Gerlach]

(#352 is merged now, so this can be rebased or merged with master to pick that up and unblock the CI)

[CAM-Gerlach]

Since it was straightforward and we'd discussed it, I went ahead with updating the branch and bumping the Sphinx-Lint version and everything's green now, so this LGTM and should be good to merge. Thanks @ezio-melotti !