pgsql: Remove obsolete commentary.

Remove obsolete commentary.

Since we got rid of non-MVCC catalog scans, the fourth reason given for
using a non-transactional update in index_update_stats() is obsolete.
The other three are still good, so we're not going to change the code,
but fix the comment.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/d1f8e7a01501c71db3ee0bcd19aab79b1ddc662e

Modified Files
--------------
src/backend/catalog/index.c | 8 --------
1 file changed, 8 deletions(-)

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