Doc: add descriptions for all QML types

Each type must have at least one paragraph of descriptive
text in addition to a \brief. Edited the briefs where necessary.

Change-Id: I0cfaa37b39bab0be8409e4bf6ac8c4b6e5a77bf3
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

src/imports/winextras/JumpDestination.qml

@@ -46,8 +46,13 @@ import QtWinExtras 1.0
     \inherits JumpListItem
     \inqmlmodule QtWinExtras
 
-    \brief Represents a file, which can be edited or viewed by application.
+    \brief Represents a file that can be edited or viewed by an application.
+
     \since 5.2
+
+    The JumpDestination type contains a path to a file that users can select
+    from a Jump List to view or edit it with an application.
+
  */
 
 JumpListItem {

src/imports/winextras/JumpLink.qml

@@ -46,8 +46,12 @@ import QtWinExtras 1.0
     \inherits JumpListItem
     \inqmlmodule QtWinExtras
 
-    \brief Represents a command to a application.
+    \brief Represents a command to execute an application.
+
     \since 5.2
+
+    The JumpLink type represents a command to execute an application.
+
  */
 
 JumpListItem {

src/imports/winextras/JumpListSeparator.qml

@@ -49,6 +49,9 @@ import QtWinExtras 1.0
     \brief Represents a task list separator.
 
     \since 5.2
+
+    The JumpListSeparator type represents a separator in a Jump List. This value
+    is used only for task lists.
  */
 
 JumpListItem {

src/imports/winextras/qquickjumplist.cpp

@@ -50,7 +50,13 @@ QT_BEGIN_NAMESPACE
     \inqmlmodule QtWinExtras
 
     \brief Enables you to modify the application Jump List.
+
     \since 5.2
+
+    The JumpList type enables you to modify Windows Jump Lists.
+
+    An application can use Jump Lists to provide users with faster access to
+    files or to display shortcuts to tasks or commands.
  */
 
 /*!
@@ -156,7 +162,9 @@ void QQuickJumpList::appendGroup(QQmlListProperty<QQuickJumpListCategory> *prope
     \brief Represents a category of custom destinations.
 
     \since 5.2
-    A category consists of several destinations and has a title.
+
+    The JumpCategory type represents a category that consists of several
+    Jump List destinations and has a title.
  */
 
 /*!

src/imports/winextras/qquickwindwmfeatures.cpp

@@ -54,9 +54,12 @@ QT_BEGIN_NAMESPACE
     \instantiates QQuickWinDwmFeatures
     \inqmlmodule QtWinExtras
 
-    \brief Enables you to extend a glass frame into the client area, as well as
-    to control the behavior of Aero Peek and Flip3D.
+    \brief Enables you to manage the Windows DWM features.
+
     \since 5.2
+
+    The WinDwmFeatures type enables you to extend a glass frame into the client
+    area, as well as to control the behavior of Aero Peek and Flip3D.
  */
 
 /*!

src/imports/winextras/qquickwintaskbarbutton.cpp

@@ -50,12 +50,14 @@ QT_BEGIN_NAMESPACE
     \instantiates QQuickWinTaskbarButton
     \inqmlmodule QtWinExtras
 
-    \brief Enables you to set overlay icons on a taskbar button, to display a
-    progress indicator, and to add a small toolbar to the window thumbnail
-    popup.
+    \brief Manages Windows taskbar buttons.
 
     \since 5.2
 
+    The WinTaskbarButton type enables you to set overlay icons on a taskbar
+    button, to display a progress indicator, and to add a small toolbar to the
+    window thumbnail popup.
+
     \sa QWinTaskbarButton
  */