Doc: Grouped the SQL example pages under sql_examples group

Change-Id: I98b9cb2acafe82e89d9d170e0f66251180011caa
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

examples/sql/doc/src/cachedtable.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example cachedtable
     \title Cached Table Example
+    \ingroup sql_examples
 
     \brief The Cached Table example shows how a table view can be used to access a database,
     caching any changes to the data until the user explicitly submits them using a

examples/sql/doc/src/drilldown.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example drilldown
     \title Drill Down Example
+    \ingroup sql_examples
 
     \brief The Drill Down example shows how to read data from a database as
     well as submit changes, using the QSqlRelationalTableModel and

examples/sql/doc/src/masterdetail.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example masterdetail
     \title Master Detail Example
+    \ingroup sql_examples
 
     \brief The Master Detail Example shows how to present data from different
     data sources in the same application. The album titles, and the

examples/sql/doc/src/querymodel.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example querymodel
     \title Query Model Example
+    \ingroup sql_examples
 
     \brief The Query Model example shows how to make customized versions of
     data obtained from a SQL query, using a model that encapsulates

examples/sql/doc/src/relationaltablemodel.qdoc

@@ -28,6 +28,7 @@
 /*! 
     \example relationaltablemodel
     \title Relational Table Model Example
+    \ingroup sql_examples
 
     \brief The Relational Table Model example shows how to use table views with a relational
     model to visualize the relations between items in a database.

examples/sql/doc/src/sqlbrowser.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example sqlbrowser
     \title SQL Browser
+    \ingroup sql_examples
 
     \brief The SQL Browser example shows how a data browser can be used to visualize
     the results of SQL statements on a live database.

examples/sql/doc/src/sqlwidgetmapper.qdoc

@@ -28,6 +28,7 @@
 /*!
     \example sqlwidgetmapper
     \title SQL Widget Mapper Example
+    \ingroup sql_examples
 
     \brief The SQL Widget Mapper example shows how to use a map information from a
     database to widgets on a form.

examples/sql/doc/src/tablemodel.qdoc

@@ -28,6 +28,7 @@
 /*! 
     \example tablemodel
     \title Table Model Example
+    \ingroup sql_examples
 
     \brief The Table Model example shows how to use a specialized SQL table model with table
     views to edit information in a database.