Document that log_autovacuum_min_duration can be used to monitor
autovacuum activity.

Per report from Marc Mamin

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/83fbfec383d7f7ef1331ba02db3d0fdf50abf112

Modified Files
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doc/src/sgml/maintenance.sgml |    4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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