added missing See also section

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@40005 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.clean/v.clean.html

@@ -257,6 +257,15 @@ v.clean type=boundary would remove nothing.
 v.clean input=testmap output=cleanmap type=line tool=rmdangle,rmdangle,rmdangle,rmdangle thresh=5,10,20,50
 </pre></div>
 
+<h2>SEE ALSO</h2>
+
+<em>
+<a HREF="v.info.html">v.info</a>,
+<a HREF="v.build.html">v.build</a>,
+<a HREF="v.digit.html">v.digit</a>,
+<a HREF="v.edit.html">v.edit</a>
+</em>
+
 <h2>AUTHORS</h2>
 
 David Gerdes, U.S. Army Construction Engineering Research Laboratory<br>