Fix incorrect comment in SetBufferCommitInfoNeedsSave().

Noah Misch spotted the fact that the old comment is in fact incorrect, due
to memory ordering hazards.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/ab77b2da8bf2cd1c8068f2f90e95c42d426aba3c

Modified Files
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src/backend/storage/buffer/bufmgr.c |    8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)

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