Log Message:
-----------
Update comment to mention "Name classification hierarchy" as place to
check for reserved words.
Modified Files:
--------------
pgsql/src/backend/parser:
gram.y (r2.489 -> r2.490)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.489&r2=2.490)