Documented signal in Receiver class

openlp/core/lib/eventreceiver.py

@@ -112,6 +112,9 @@ class EventReceiver(QtCore.QObject):
     ``slidecontroller_live_spin_delay``
         Pushes out the loop delay.
         
+    ``slidecontroller_update_slide_advance``
+        Updates the slide_advance variable from the saved settings.
+
     ``slidecontroller_live_stop_loop``
         Stop the loop on the main display.