Doc: keyboard shortcuts for General Messages and Version Control pages

Change-Id: I9f397bd4f327b2db0316b4b06ddaf4fc4dd4898d
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

doc/src/howto/creator-keyboard-shortcuts.qdoc

@@ -194,6 +194,11 @@
         \row
             \o Toggle \gui{Compile Output} pane
             \o Alt+4 (Cmd+4 on Mac OS X)
+        \row
+            \o Toggle other output panes
+            \o Alt+number (Cmd+number on Mac OS X)
+
+            Where the number is the number of the output pane.
         \row
             \o Activate \gui Bookmarks pane
             \o Alt+M

doc/src/howto/creator-tips.qdoc

@@ -100,6 +100,10 @@
 
     \endlist
 
+    To open the other output panes, such as \gui{General Messages} and
+    \gui{Version Control}, select \gui Window > \gui {Output Panes}. The menu
+    items also display the keyboard shortcuts that you can use.
+
     For more information about output panes, see \l{Viewing Output}.
 
     \section1 Using Keyboard Shortcuts