Log Message:
-----------
Clarify 'cert' authentication documention.
Modified Files:
--------------
pgsql/doc/src/sgml:
client-auth.sgml (r1.118 -> r1.119)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/client-auth.sgml?r1=1.118&r2=1.119)