Improve C comments in GetSnapshotData.

Move discussion of why our algorithm for taking snapshots in recovery
to a more appropriate location in the function, and delete incorrect
mention of taking a lock.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/4b373e42d1efd24f871193ce8178c41f199c5df3

Modified Files
--------------
src/backend/storage/ipc/procarray.c |   14 ++++++--------
1 files changed, 6 insertions(+), 8 deletions(-)

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