[COMMITTERS] pgsql: Make sure we only try to free snapshots that have been passed

Log Message:
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Make sure we only try to free snapshots that have been passed through
CopySnapshot, per Neil Conway. Also add a comment about the assumption in
GetSnapshotData that the argument is statically allocated.

Also, fix some more typos in comments in snapmgr.c.

Modified Files:
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pgsql/src/backend/storage/ipc:
procarray.c (r1.44 -> r1.45)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/ipc/procarray.c?r1=1.44&r2=1.45)
pgsql/src/backend/utils/time:
snapmgr.c (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/time/snapmgr.c?r1=1.3&r2=1.4)

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