wxGUI/animation: update manual

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58577 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/animation/g.gui.animation.html

@@ -19,6 +19,9 @@ Animation Tool allows you to:
   <li>export animation as a series of images, animated GIF, AVI or SWF</li>
   <li>choose format of time labels in case of animating maps with absolute time</li>
   <li>choose background color</li>
+  <li>set starting and ending region in order to change region during animation
+  (alternatively you can set N-S/E-W values instead of the ending region;
+  these are used for making the region smaller or larger for each step)</li>
 </ul>
 
 <p>