document issue in ticket #2209 in FAQ.  Probably only affects me, but who knows.

git-svn-id: http://svn.osgeo.org/postgis/trunk@11105 b70326c6-7e19-0410-871a-916f4a2858ee
oops forgot pretty anchor

git-svn-id: http://svn.osgeo.org/postgis/trunk@11106 b70326c6-7e19-0410-871a-916f4a2858ee