Log Message:
-----------
Remove OID/foreign key mention in psql variable interpolation docs.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
psql-ref.sgml (r1.201 -> r1.202)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml?r1=1.201&r2=1.202)