Reclassify replication-related GUC variables as "master" and "standby".

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

Commit: 60a81ad13374265cf9aecdc72daecd0410936779
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-07-07T19:11:41Z
Releases: 9.2.0
Reclassify replication-related GUC variables as "master" and "standby".

Per discussion, this structure seems more understandable than what was
there before.  Make config.sgml and postgresql.conf.sample agree.

In passing do a bit of editorial work on the variable descriptions.

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