wx.iscatt: doc image changed from png to jpg

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57880 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/docs/wxGUI.iscatt.html

@@ -30,7 +30,7 @@ The main feature of the tool is the interactivity, which allows user to:
 
 <center>
 <br>
-<img src="wxGUI_iscatt.png" border="1" alt="Interactive Scatter Plot Tool">
+<img src="wxGUI_iscatt.jpg" border="1" alt="Interactive Scatter Plot Tool">
 <br><br>
 </center>