Обсуждение: pgsql: Improve pg_autovacuum documentation to clarify that the enabled

Log Message:
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Improve pg_autovacuum documentation to clarify that the enabled field cannot
prevent anti-wraparound vacuuming, and to caution against setting unreasonably
small values of freeze_max_age.  Also put in a notice that this catalog is
likely to disappear entirely in some future release.  Per discussion of
bug #3898 from Steven Flatt.

Tags:
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REL8_2_STABLE

Modified Files:
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    pgsql/doc/src/sgml:
        catalogs.sgml (r2.137 -> r2.137.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml?r1=2.137&r2=2.137.2.1)