Doc: selecting tarball contents

Update screenshot

Change-Id: I7904db58741bab6981cc8637cb729dc754ca061b
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>

doc/src/linux-mobile/creator-publish-maemo-extras-devel.qdoc

@@ -85,7 +85,11 @@
             You can also select \gui {Request upload rights} to use the Maemo
             Extras Assistant to validate your Garage account.
 
-        \o  Select \gui Commit to publish the application.
+        \o  Select \gui Commit to select the files to include in the source
+            package.
+
+        \o  Select \gui OK to build the source package, and optionally, publish
+            the application.
 
     \endlist