Log Message:
-----------
Update GIN limitations documentation to match current reality.
Modified Files:
--------------
pgsql/doc/src/sgml:
gin.sgml (r2.18 -> r2.19)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/gin.sgml?r1=2.18&r2=2.19)