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)
