Doc: Give C++ class lists consistent titles

The majority format is "<Qt Module> C++ Classes" (see
http://qt-project.org/doc/qt-5.0/qtdoc/modules-cpp.html

)

Change-Id: I3a4eccbf19296d0fb1d4d5e93892eb38fd9e6823
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

doc/src/connectivity.qdoc

@@ -97,7 +97,7 @@ Related Topics:
     \list
         \li \l {Network Programming API}
         \li \l {Network Programming with Qt}
-        \li \l {Qt Network - C++ Classes}
+        \li \l {Qt Network C++ Classes}
         \li \l {Secure Sockets Layer (SSL) Classes}
         \li \l {Bearer Management}
     \endlist

doc/src/datastorage.qdoc

@@ -112,7 +112,7 @@ table with the foreign key).
 
 \list
 \li \l {Qt SQL}
-\li \l {Qt SQL Module - C++ Classes}
+\li \l {Qt SQL C++ Classes}
 \li \l {Connecting to Databases}
 \li \l {SQL Database Drivers}
 \li \l {Creating Data-Aware Forms}

doc/src/whatsnew.qdoc

@@ -177,7 +177,7 @@
      \li QQuickItem
      \li QQuickPaintedItem
     \endlist
-    See \l{Qt Quick Module C++ Classes} for the complete list.
+    See \l{Qt Quick C++ Classes} for the complete list.
 
     The QtQuick 2.0 QML module is a major update, and the following sections
     outline the features that come with it: