Doc: Add list with widgets examples using layouts

Change-Id: I585cd63f68220467de1beed3346cdaa12af2b34b
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

examples/widgets/doc/src/addressbook-tutorial.qdoc

@@ -29,6 +29,7 @@
     \page tutorials-addressbook.html
 
     \title Address Book Tutorial
+    \ingroup examples-layout
     \brief An introduction to GUI programming, showing how to put together a
     simple yet fully-functioning application.
 

examples/widgets/doc/src/borderlayout.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example layouts/borderlayout
     \title Border Layout Example
+    \ingroup examples-layout
     \brief Shows how to arrange child widgets along a border.
 
     \e{Border Layout} implements a layout that arranges child widgets to

examples/widgets/doc/src/calculator.qdoc

@@ -29,6 +29,7 @@
     \example widgets/calculator
     \title Calculator Example
     \ingroup examples-widgets
+    \ingroup examples-layout
     \brief The example shows how to use signals and slots to implement the
     functionality of a calculator widget, and how to use QGridLayout
     to place child widgets in a grid.

examples/widgets/doc/src/calendarwidget.qdoc

@@ -29,6 +29,7 @@
     \title Calendar Widget Example
     \example widgets/calendarwidget
     \ingroup examples-widgets
+    \ingroup examples-layout
     \brief The Calendar Widget example shows use of QCalendarWidget.
 
     \borderedimage calendarwidgetexample.png

examples/widgets/doc/src/echoplugin.qdoc

@@ -29,6 +29,7 @@
     \example tools/echoplugin
     \title Echo Plugin Example
     \ingroup examples-widgets-tools
+    \ingroup examples-layout
 
     \brief This example shows how to create a Qt plugin.
 

examples/widgets/doc/src/flowlayout.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example layouts/flowlayout
     \title Flow Layout Example
+    \ingroup examples-layout
     \brief Shows how to arrange widgets for different window sizes.
 
     \e{Flow Layout} implements a layout that handles different window sizes. The

examples/widgets/doc/src/imagecomposition.qdoc

@@ -29,6 +29,7 @@
     \example painting/imagecomposition
     \title Image Composition Example
     \ingroup examples-painting
+    \ingroup examples-layout
     \brief Shows how composition modes work in QPainter.
 
     \brief The Image Composition example lets the user combine images

examples/widgets/doc/src/menus.qdoc

@@ -29,6 +29,7 @@
     \example mainwindows/menus
     \title Menus Example
     \ingroup examples-mainwindow
+    \ingroup examples-layout
 
     \brief The Menus example demonstrates how menus can be used in a main
     window application.

examples/widgets/doc/src/simpletreemodel.qdoc

@@ -29,6 +29,7 @@
     \example itemviews/simpletreemodel
     \title Simple Tree Model Example
     \ingroup examples-itemviews
+    \ingroup examples-layout
     \brief The Simple Tree Model example shows how to use a hierarchical model
     with Qt's standard view classes.
 

examples/widgets/doc/src/sub-attaq.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example animation/sub-attaq
     \title Sub-Attaq
+    \ingroup examples-layout
 
     \brief This example shows Qt's ability to combine \l{The Animation Framework}{the animation framework}
     and \l{The State Machine Framework}{the state machine framework} to create a game.

src/widgets/doc/src/widgets-and-layouts/layout.qdoc

@@ -392,7 +392,6 @@
     Many Qt Widgets \l{Qt Widgets Examples}{examples} already use layouts,
     however, several examples exist to showcase various layouts.
 
-    \list
-    \li \l{Layout Examples}
-    \endlist
+    \annotatedlist examples-layout
+
 */