Doc: Add remaining SQL examples to Data Processing & I/O category

Task-number: QTBUG-115174
Pick-to: 6.5 6.6
Change-Id: Idd8ba8504efb17f0e4a11b3c36b991739251f2ef
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

examples/sql/doc/src/books.qdoc

@@ -5,6 +5,7 @@
     \example books
     \title Books
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
     \brief Shows how to use Qt SQL classes with a model/view framework.
 
     The Books example shows how Qt's SQL classes can be used with the model/view

examples/sql/doc/src/drilldown.qdoc

@@ -5,6 +5,7 @@
     \example drilldown
     \title Drill Down Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example masterdetail
     \title Master Detail Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example querymodel
     \title Query Model Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example relationaltablemodel
     \title Relational Table Model Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example sqlbrowser
     \title SQL Browser
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example sqlwidgetmapper
     \title SQL Widget Mapper Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \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

@@ -5,6 +5,7 @@
     \example tablemodel
     \title Table Model Example
     \ingroup sql_examples
+    \examplecategory {Data Processing & I/O}
 
     \brief The Table Model example shows how to use a specialized SQL table model with table
     views to edit information in a database.