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

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.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e96b697adb138b0bbe34082761b4e4538abcc9e6

Modified Files
--------------
doc/src/sgml/pgstatstatements.sgml | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

--
Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-committers