Log Message:
-----------
Fix markup, other minor editing for recent btree_gist doc changes.
Modified Files:
--------------
pgsql/doc/src/sgml:
btree-gist.sgml (r1.6 -> r1.7)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/btree-gist.sgml?r1=1.6&r2=1.7)