display: Fix GraphicsWindow::get_pointer() listed as deprecated

[skip ci]

panda/src/display/graphicsWindow.cxx

@@ -353,9 +353,9 @@ disable_pointer_mode(int device) {
 }*/
 
 /**
- * Returns the MouseData associated with the nth input device's pointer.  This
- * is deprecated; use get_pointer_device().get_pointer() instead, or for raw
- * mice, use the InputDeviceManager interface.
+ * Returns the MouseData associated with the nth input device's pointer.
+ * Using this to access raw mice (with an index other than 0) is deprecated,
+ * see the InputDeviceManager interface instead.
  */
 MouseData GraphicsWindow::
 get_pointer(int device) const {