wxGUI/modeler: update figure in the manual

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58615 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gmodeler/g.gui.gmodeler.html

@@ -38,7 +38,8 @@ The Graphical Modeler allows you to:
 <center>
 <br>
 <img src="gmodeler_frame.jpg" border="1" alt="screenshot">
-<br><br>
+<br>
+Figure: A model to perform unsupervised classification using MLC and SMAP
 </center>
 
 <h2>SEE ALSO</h2>