Doc: add link to field descriptions from Editor settings topic

Add link to "Viewing Function Tooltips".

Update screenshot, because the tooltip fields were moved around.

Change-Id: Ic5e8d3d8c9a859c6a6748d631640b42239ea6f3f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

doc/src/projects/creator-projects-settings-editor.qdoc

@@ -67,6 +67,8 @@
 
         \li \l{Configuring Fonts}
 
+        \li \l{Viewing Function Tooltips}
+
     \endlist
 
 */