libvector docs: advertise Vect_line_buffer2() rather than Vect_line_buffer()

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@71718 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/vector/vectorlib_lists.dox

@@ -159,7 +159,7 @@ programming. The programmer should use only routines with this prefix.
 
 \subsection vlibBuffer Vector buffer functions
 
- - Vect_line_buffer()
+ - Vect_line_buffer2()
 
  - Vect_line_parallel()