doc: the typo train

Context

This is the current edition of the typo train, an MR batching minor and non-controversial changes to the doc. Feel free to add your own commits to the typo-doc branch.

Manually testing the MR

Check that the commits observe the mentioned criteria, and that they improve the doc.

Examine the doc artifact.

Checklist

• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR