describe vlines type (merge from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@31766 15284696-431f-4ddb-bdfa-cd5b030d7da7

ps/ps.map/description.html

@@ -1314,6 +1314,8 @@ USAGE:	<B>vlines</B> vectormap
 </PRE>
 The user can specify:
 <P>
+<B>type</B> - the default is lines only;
+<P>
 <B>color</B> - color of the vector lines or area boundaries;
 <P>
 <B>rgbcolumn</B> - name of color definition column used for the vector lines or area boundaries;