Typo doc

Context

This is an instance of the typo train, an MR grouping typo fixes and other minor (and not so urgent) changes to the doc. It is open for contributions from anyone, as long as in Draft mode.

See meta-issue #2329 for more details.

Manually testing the MR

Checklist

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