update manual with coauthor

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@43045 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.distance/v.distance.html

@@ -145,6 +145,7 @@ given upload option.
 Janne Soimasuo 1994, University of Joensuu, Faculty of Forestry, Finland<BR>
 Cmd line coordinates support: Markus Neteler, ITC-irst, Trento, Italy<BR>
 Updated for 5.1: Radim Blazek, ITC-irst, Trento, Italy<BR>
-Matrix-like output by Martin Landa, FBK-irst, Trento, Italy
+Matrix-like output by Martin Landa, FBK-irst, Trento, Italy<BR>
+Improved processing speed: Markus Metz
 
 <p><i>Last changed: $Date$</i>