Document WallpaperInterface

Change-Id: I25819a1d11fb63d3685a6fa0940e0c2f88e5cfd4

src/plasmaquick/Mainpage.dox

@@ -7,11 +7,16 @@ It should not be used directly, however some classes are exposed to Plasma as at
 Namely:
  - AppletInterface
  - ContainmentInterface
-
 which are exposed as "Plasmoid" for applets and containments respectively.
 
 QML applets should import org.kde.plasma.plasmoid 2.0 in order to access this attached object
 
+
+ - WallpaperInterface
+which is exposed as to wallpapers as the attached propety "wallpaper".
+It does not require any special imports
+
+
 */
 
 // DOXYGEN_SET_PROJECT_NAME = Plasma

src/scriptengines/qml/plasmoid/wallpaperinterface.h

@@ -37,6 +37,13 @@ class ConfigPropertyMap;
 class QmlObject;
 }
 
+/**
+ * @class WallpaperInterface
+ *
+ * @brief This class is exposed to wallpapers as the attached property "wallpaper"
+ *
+ *
+ */
 class WallpaperInterface : public QQuickItem
 {
     Q_OBJECT