manual: gis.m -> wxGUI

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52422 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/projectionintro.html

@@ -53,7 +53,7 @@ Alternatively, <a href="v.rectify.html">v.rectify</a> rectifies a vector
 by computing a coordinate transformation for each object in the vector
 based on the control points. 
 <p>
-A graphical user interface is provided by <a href="gis.m.html">gis.m</a>.
+A graphical user interface is provided by <a href="wxGUI.html">wxGUI</a>.
 
 <h3>References</h3>