fix missing tag in ST_Tesselate add more examples for ST_3DIntersection

git-svn-id: http://svn.osgeo.org/postgis/trunk@12782 b70326c6-7e19-0410-871a-916f4a2858ee
fix typo in image names

git-svn-id: http://svn.osgeo.org/postgis/trunk@12783 b70326c6-7e19-0410-871a-916f4a2858ee