Doc: add docs for model editor

Change-Id: I6bae6dc22de170c9f43cefe474e9b684675e4ff6
Reviewed-by: Jochen Becher <jochen_becher@gmx.de>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

doc/src/editors/creator-coding.qdoc

@@ -26,7 +26,7 @@
     \contentspage {Qt Creator Manual}
     \previouspage creator-usability.html
     \page creator-coding.html
-    \nextpage creator-editor-functions.html
+    \nextpage creator-modeling.html
 
     \title Coding
 
@@ -34,6 +34,12 @@
 
     \list
 
+        \li \l{Modeling}
+
+            You can use the experimental model editor to create Universal
+            Modeling Language (UML) style models with structured diagrams and
+            store them in XML format.
+
         \li \l{Writing Code}
 
             Writing, editing, and navigating in source code are core tasks in

doc/src/editors/creator-editors-writing-code.qdoc

@@ -24,7 +24,7 @@
 
 /*!
     \contentspage {Qt Creator Manual}
-    \previouspage creator-coding.html
+    \previouspage creator-modeling.html
     \page creator-editor-functions.html
     \nextpage creator-coding-navigating.html
 

doc/src/qtcreator.qdoc

@@ -76,6 +76,7 @@
         \row
             \li \b {\l{Coding}}
                 \list
+                    \li \l{Modeling}
                     \li \l{Writing Code}
                     \li \l{Finding}
                     \li \l{Refactoring}
@@ -195,6 +196,7 @@
         \endlist
         \li \l{Coding}
         \list
+        \li \l{Modeling}
         \li \l{Writing Code}
             \list
                 \li \l{Working in Edit Mode}