Doc: various improvements for pg_basebackup reference page.
Put the -r option in the right section (it certainly isn't an option controlling "the location and format of the output"). Clarify the behavior of the tablespace and waldir options (that part per gripe from email@example.com). Make a large number of small copy-editing fixes in text that visibly wasn't written by native speakers, and try to avoid grammatical inconsistencies between the descriptions of the different options. Back-patch to v13, since HEAD hasn't meaningfully diverged yet. Discussion: https://firstname.lastname@example.org
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