Docs: explain contrib/pg_stat_statements' handling of GC failure.

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

Commit: f8a5e579d18b268f287d81b8a4bd54955ca90c37
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-10-05T16:44:12Z
Releases: 9.6.0
Docs: explain contrib/pg_stat_statements' handling of GC failure.

Failure to perform garbage collection now has a user-visible effect, so
explain that and explain that reducing pgss_max is the way to prevent it.
Per gripe from Andrew Dunstan.

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doc/src/sgml/pgstatstatements.sgml modified +16 −2

Documentation touched