STR#2600 again: more detailed Doxygen comments of the FL_SCREEN_CONFI…

…GURATION_CHANGED event.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9124 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl.cxx

@@ -779,6 +779,8 @@ static handler_link *handlers = 0;
   - \ref FL_SHORTCUT events that are not recognized by any widget.
     This lets you provide global shortcut keys.
   - \ref FL_SCREEN_CONFIGURATION_CHANGED events.
+    Under X11, this event requires the libXrandr.so shared library to be
+    loadable at run-time and the X server to implement the RandR extension.
   - System events that FLTK does not recognize.  See fl_xevent.
   - \e Some other events when the widget FLTK selected returns
     zero from its handle() method.  Exactly which ones may change