Doc: copy-editing for debug_invalidate_system_caches_always description.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: f9b809e7fbe36cd3fe1ce33edb277288a31da386
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-05-08T15:33:13Z
Releases: 14.0
Doc: copy-editing for debug_invalidate_system_caches_always description.

I came to fix "useful only useful", but the more I looked at the text
the more things I thought could be improved.

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doc/src/sgml/config.sgml modified +10 −9

Documentation touched