pgsql: Fix a couple of places that still claimed LC_COLLATE and LC_CTYPE

Log Message:
-----------
Fix a couple of places that still claimed LC_COLLATE and LC_CTYPE can't
be changed after initdb.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        charset.sgml (r2.91 -> r2.92)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/charset.sgml?r1=2.91&r2=2.92)
        config.sgml (r1.212 -> r1.213)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.212&r2=1.213)