Clarify operation of online checkpoints.
Previous comments left, but were too obscure
for such an important aspect of the system.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/9f98704b8229f75fb6ec6e379c23cfea51a8f1e4

Modified Files
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src/backend/access/transam/xlog.c |   12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

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