Log Message:
-----------
Add docs for a couple of formerly-undocumented geometric conversion functions.
Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.235 -> r1.236)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.235&r2=1.236)