Tools: document Swift SBRE log message

Author: peterbarker

Tools/autotest/vehicle_test_suite.py

@@ -3093,7 +3093,6 @@ def LoggerDocumentation_greylist(self):
         are currently known as undocumented'''
         return set([
             "FTN3",  # gyrofft
-            "SBRE",  # septentrio
 
             "SAF1",  # blimp-sim
             "SAN1",  # blimp-sim