Tag dialog examples and create dialog examples group

Change-Id: I0049b841dd5aee806e8aed36af069b0507e3c9f1
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

examples/widgets/doc/src/classwizard.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/classwizard
     \title Class Wizard Example
+    \ingroup examples-dialogs
 
     \brief The License Wizard example shows how to implement linear
     wizards using QWizard.

examples/widgets/doc/src/configdialog.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/configdialog
     \title Config Dialog Example
+    \ingroup examples-dialogs
 
     \brief The Config Dialog examples shows how a configuration dialog can be created by
     using an icon view with a stacked widget.

examples/widgets/doc/src/extension.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/extension
     \title Extension Example
+    \ingroup examples-dialogs
 
     \brief The Extension example shows how to add an extension to a QDialog
     using the QAbstractButton::toggled() signal and the

examples/widgets/doc/src/findfiles.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/findfiles
     \title Find Files Example
+    \ingroup examples-dialogs
 
     \brief The Find Files example shows how to use QProgressDialog to provide
     feedback on the progress of a slow operation. The example also

examples/widgets/doc/src/licensewizard.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/licensewizard
     \title License Wizard Example
+    \ingroup examples-dialogs
 
     \brief The License Wizard example shows how to implement complex wizards in
     Qt.

examples/widgets/doc/src/standarddialogs.qdoc

@@ -28,6 +28,7 @@
 /*! 
     \example dialogs/standarddialogs
     \title Standard Dialogs Example
+    \ingroup examples-dialogs
 
     \brief The Standard Dialogs example shows the standard dialogs that are provided by Qt.
 

examples/widgets/doc/src/tabdialog.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/tabdialog
     \title Tab Dialog Example
+    \ingroup examples-dialogs
 
     \brief The Tab Dialog example shows how to construct a tab dialog using the
     QTabWidget class.

examples/widgets/doc/src/trivialwizard.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example dialogs/trivialwizard
     \title Trivial Wizard Example
+    \ingroup examples-dialogs
 
     \brief The Trivial Wizard example illustrates how to create a linear three-page
     registration wizard using three instances of QWizardPage and one instance

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

@@ -95,3 +95,20 @@
 
 */
 
+
+/*!
+    \group examples-dialogs
+    \ingroup all-examples
+    \title Dialog Examples
+    \brief Using Qt's standard dialogs and building and using custom dialogs.
+
+    \image dialog-examples.png
+
+    Qt includes standard dialogs for many common operations, such as file
+    selection, printing, and color selection.
+
+    Custom dialogs can also be created for specialized modal or modeless
+    interactions with users.
+*/
+
+