Main: TRect - clarify that rects extend downwards.
Main: TRect - clarify that rects extend downwards.

To clarify and remove confusion.

paroj/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre