Log Message:
-----------
Clean up psql -c documentation that uses \\.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
psql-ref.sgml (r1.176 -> r1.177)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.176&r2=1.177)