What

This is an instance of the typo train, an MR grouping typo fixes and other minor (and not so urgent) changes to the doc.

See meta-issue #2329 for more details.

Why

Encourage doc fixes from anyone.

Nothing is specified in advance! Rather, doc fixes are welcome from anyone, as long as in Draft mode.

Read the changes and check that they are correct and they bring some improvements.

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR