Doc: Add links to Qt 6 changes files from module index

Task-number: QTBUG-84051
Change-Id: Iac25df135c9d73a990b41243e08cd38ea78296a4
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

src/concurrent/doc/src/qtconcurrent-index.qdoc

@@ -158,6 +158,10 @@
     might take some time, in this case we recommend specifying the begin and end iterators
     for the container instead.
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt Concurrent} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses
 
     The Qt Concurrent module is available under commercial licenses from \l{The Qt Company}.

src/dbus/doc/src/qtdbus-index.qdoc

@@ -208,6 +208,10 @@
     Information about the messages will be written to the console the application
     was launched from.
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt DBus} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Attributions
 
     The Qt D-Bus module is available under commercial licenses from \l{The Qt Company}.

src/gui/doc/src/qtgui.qdoc

@@ -194,6 +194,10 @@
 
     More info in \l{Drag and Drop}
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt GUI} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Attributions
 
     Qt GUI is available under commercial licenses from \l{The Qt Company}.

src/network/doc/src/qtnetwork.qdoc

@@ -60,6 +60,10 @@
     \li \l{Qt Network C++ Classes}{C++ Classes}
     \endlist
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt Network} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Attributions
 
     Qt Network is available under commercial licenses from \l{The Qt Company}.

src/opengl/doc/src/qtopengl-index.qdoc

@@ -66,6 +66,10 @@
     \include module-use.qdocinc building with qmake
     \snippet snippets/snippets.pro qmake_use
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt OpenGL} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Trademarks
 
     The Qt OpenGL module is available under commercial licenses from \l{The Qt Company}.

src/printsupport/doc/src/qtprintsupport-index.qdoc

@@ -174,6 +174,10 @@
   \include module-use.qdocinc building with qmake
   \snippet snippets/snippets.pro qmake_use
 
+  \section1 Module Evolution
+  \l{Porting to Qt 6 - Qt Print Support} lists important changes in the module API
+  and functionality that were done for the Qt 6 series of Qt.
+
   \section1 Licenses and Trademarks
 
   The Qt Print Support module is available under commercial licenses from \l{The Qt Company}.

src/sql/doc/src/qtsql.qdoc

@@ -49,6 +49,10 @@
     \include module-use.qdocinc building with qmake
     \snippet snippets/snippets.pro qmake_use
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt SQL} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Attributions
 
     Qt SQL is available under commercial licenses from \l{The Qt Company}.

src/testlib/doc/src/qttest-index.qdoc

@@ -56,6 +56,10 @@
         \li \l{Qt Test Tutorial}
     \endlist
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt Test} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses and Attributions
 
     Qt Test is available under commercial licenses from \l{The Qt Company}.

src/widgets/doc/src/qtwidgets-index.qdoc

@@ -121,6 +121,10 @@ interfaces
     \include module-use.qdocinc building with qmake
     \snippet snippets/snippets.pro qmake_use
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt Widgets} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses
 
     The Qt Widgets module is available under commercial licenses from \l{The Qt Company}.

src/xml/doc/src/qtxml-index.qdoc

@@ -46,6 +46,10 @@
     \include module-use.qdocinc building with qmake
     \snippet snippets/snippets.pro qmake_use
 
+    \section1 Module Evolution
+    \l{Porting to Qt 6 - Qt XML} lists important changes in the module API
+    and functionality that were done for the Qt 6 series of Qt.
+
     \section1 Licenses
 
     The Qt XML module is available under commercial licenses from \l{The Qt Company}.