Re-add (T) modifiers in docs for ST_Buffer and ST_Intersection

Closes #3331 git-svn-id: http://svn.osgeo.org/postgis/trunk@14275 b70326c6-7e19-0410-871a-916f4a2858ee

Author: Sandro Santilli

doc/reference_processing.xml

@@ -6,6 +6,7 @@
 <refname>ST_Buffer</refname>
 
 <refpurpose>
+(T)
 Returns a geometry covering all points within a given distance
 from the input geometry.
 </refpurpose>
@@ -1679,6 +1680,7 @@ SELECT ST_AsText(
 <refname>ST_Intersection</refname>
 
 <refpurpose>
+(T)
 Returns a geometry that represents the shared portion of geomA and geomB.
 </refpurpose>
 </refnamediv>