Revised QxtDockWidget docs.
Revised QxtDockWidget docs.

mmitkevich/libqxt,hrobeers/qxtweb-qt5,hrobeers/qxtweb-qt5,mmitkevich/libqxt,hrobeers/qxtweb-qt5,hrobeers/qxtweb-qt5,mmitkevich/libqxt,hrobeers/qxtweb-qt5,mmitkevich/libqxt