Log Message:
-----------
Mention hash opclasses in 'System Dependencies on Operator Classes',
which previously only talked about btree opclasses.
Modified Files:
--------------
pgsql/doc/src/sgml:
xindex.sgml (r1.60 -> r1.61)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xindex.sgml?r1=1.60&r2=1.61)