wxGUI: update keyboard shortcuts (https://trac.osgeo.org/grass/ticket/2756)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@67853 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/docs/wxGUI.html

@@ -603,11 +603,17 @@ the computational region extents.
   <dt>Esc</dt>
   <dd>Hide command tooltips</dd>
   <dt>Ctrl+Space</dt>
-  <dd>Map entries without arguments (as in <tt>r.info [mapname]</tt>)</dd>
+  <dd>Show auto-complete suggestions</dd>
   <dt>Up/Down</dt>
   <dd>List command history</dd>
   <dt>Enter</dt>
   <dd>Run command</dd>
+  <dt>Ctrl++</dt>
+  <dd>Increase font size (numerical keyboard plus key)</dd>
+  <dt>Ctrl+-</dt>
+  <dd>Decrease font size (numerical keyboard minus key)</dd>
+  <dt>Ctrl+mouse wheel</dt>
+  <dd>Increase or decrease font size</dd>
 </dl>
 
 <h4>Map Display</h4>