Add some more documentation for RefPointer.
Add some more documentation for RefPointer.

iperry/qt-gstreamer,iperry/qt-gstreamer,ylatuya/qt-gstreamer,cyndis/qtgstreamer,GStreamer/qt-gstreamer,dejunk/gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,knuesel/qt-gstreamer,iperry/qt-gstreamer,shadeslayer/qtgstreamer,detrout/qt-gstreamer,knuesel/qt-gstreamer,detrout/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,nasserGanjali/QtGStreamer,comicfans/libqtgstreamer,shadeslayer/qtgstreamer,GStreamer/qt-gstreamer,comicfans/libqtgstreamer,tswindell/qt-gstreamer,cyndis/qtgstreamer,nasserGanjali/QtGStreamer,GStreamer/qt-gstreamer,dejunk/gstreamer,cyndis/qtgstreamer,nasserGanjali/QtGStreamer,shadeslayer/qtgstreamer,ylatuya/qt-gstreamer,comicfans/libqtgstreamer,ylatuya/qt-gstreamer,tswindell/qt-gstreamer,detrout/qt-gstreamer,knuesel/qt-gstreamer,dejunk/gstreamer,tswindell/qt-gstreamer