doc: the typo train

Context

This MR is closed. The next edition is !3687 (merged).

This is an old edition of the typo train, containing typo fixes and other non-controversial changes to the documentation of Tezos. Feel free to add you contributions in this branch!

Manually testing the MR

Check that contributions respect the above criteria and they bring improvement.

Build the doc, check for errors, and inspect the changes.

Checklist

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