Add C comment about the fact that the autovacuum limit can go backwards
by 3, but that is it OK.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/76e5b4c85d5d4830888044fc885b1da0d781aed0

Modified Files
--------------
src/backend/postmaster/autovacuum.c |    1 +
1 files changed, 1 insertions(+), 0 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-05-09 12:56:07
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