Document Studio Components for the context sensitive help

The studio components don't have help incorporated. The QML types that are delivered give empty page when user press F1.

We need to have the components documented

1) name of the component

2) purpose

3) API 

codereview.qt-project Code Review - qt-labs/qtquickdesigner-components.git/tree - src/imports/components/

Arc - (documented) ArcItem.qml

Border - (documented) BorderItem.qml

Ellipse - (documented) EllipseItem.qml

Flipable - (documented) FlipableItem.qml

Group - (documented) GroupItem.qml

Pie - (documented) PieItem.qml

Rectangle - (documented) RectangleItem.qml

Regular Polygon - (documented) RegularPolygonItem.qml

SVG Path Item - (documented) SvgPathItem.qml

Triangle - (documented) TriangleItem.qml