Clean up some GUC declarations and comments

Michael Paquier <michael@paquier.xyz>

Commit: 7d25958453a60337bcb7bcc986e270792c007ea4
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-10-25T05:06:07Z
Releases: 16.0
Clean up some GUC declarations and comments

This adjusts a few things for GUCs related to logical replication,
replication slots and WAL senders, in the shape of incorrect comments
and values inconsistent with their initial default value.

Author: Peter Smith
Reviewed-by: Nathan Bossart, Tom Lane, Justin Pryzby
Discussion: https://postgr.es/m/CAHut+PtHE0XSfjjRQ6D4v7+dqzCw=d+1a64ujra4EX8aoc_Z+w@mail.gmail.com

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