Doc: Added section about Qt Quick Layouts in the layouts use case page.

-also mentioned that Qt Quick 2.1 is required

Task-number: QTBUG-33595
Change-Id: I5cfd2e478fc16ecca792705d56aaddd614759315
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>

doc/src/qmlapp/usecases/layouts.qdoc

@@ -63,7 +63,7 @@ For full details, see \l {Positioning with Anchors} and the documentation of the
 \image qmlapp/qml-uses-layouts-anchors.png
 
 
-\section1 Positioners and Layouts
+\section1 Positioners
 
 For the common case of wanting to \e position a set of types in a regular pattern, Qt Quick provides some positioner
 types. Items placed in a positioner are automatically positioned in some way; for example, a \l Row positions items to be
@@ -76,6 +76,57 @@ For full details see \l {Item Positioners} and the documentation for \l{qtquick-
 
 \image qmlapp/qml-uses-layouts-positioners.png
 
-If \e{positioning and resizing} is desired, you can use the layouts in \l{Qt Quick Layouts}.
+\section1 Layout Types
+
+\e{Layout types} function in a similar way as positioners but allow further refinement or
+restrictions to the layout. Specifically, the layout types allow you to:
+
+\list
+\li set the alignment of text and other items
+\li resize and fill the allotted application areas automatically
+\li set size constraints such as minimum or maximum dimensions
+\li set the spacing between items within the layout
+\endlist
+
+\qml
+    GroupBox {
+        id: gridBox
+        title: "Grid layout"
+        Layout.fillWidth: true
+
+        GridLayout {
+            id: gridLayout
+            rows: 3
+            flow: GridLayout.TopToBottom
+            anchors.fill: parent
+            Label { text: "Line 1" }
+            Label { text: "Line 2" }
+            Label { text: "Line 3" }
+
+            TextField { }
+            TextField { }
+            TextField { }
+
+            TextArea {
+                text: "This widget spans over three rows in the GridLayout.\n"
+                      + "All items in the GridLayout are implicitly positioned from top to bottom."
+                Layout.rowSpan: 3
+                Layout.fillHeight: true
+                Layout.fillWidth: true
+            }
+        }
+    }
+\endqml
+The snippet above comes from the \l{Qt Quick Controls - Basic Layouts Example}{Basic Layouts} example. The
+snippet shows the simplicity of adding various fields and items in a layout. The \l GridLayout can
+be resized and its format are customizable through various properties.
+
+For more information about the layout types, visit:
+\list
+\li \l{Qt Quick Layouts Overview}
+\li \l{Qt Quick Controls - Basic Layouts Example}{Basic Layouts} example
+\endlist
+
+\note \l{Qt Quick Layouts} was introduced in Qt 5.1 and requires \l{Qt Quick} 2.1.
 
 */