#2696: correct the doco that ST_NumInteriorRings no longer works with multipolygons since polys

git-svn-id: http://svn.osgeo.org/postgis/trunk@12412 b70326c6-7e19-0410-871a-916f4a2858ee
get rid of synonym description - don't want to have to remember to update 2 functions all the time.

git-svn-id: http://svn.osgeo.org/postgis/trunk@12413 b70326c6-7e19-0410-871a-916f4a2858ee
remove more too much information

git-svn-id: http://svn.osgeo.org/postgis/trunk@12415 b70326c6-7e19-0410-871a-916f4a2858ee