Task SW-533: Add documentation for switch_firmware

MAC/Services/TBB/TBBServer/lib/tbbservice.py

@@ -225,7 +225,12 @@ class TBBControlService:
 
 
         def switch_firmware(stations, mode):
-            log_message = "Switching TBB firmware for mode %s on stations %s" % (mode, stations)
+            """
+            Command TBBs to switch to one of two firmwares:  sub-band mode or raw voltage mode.
+            :param stations:  string - Only TBBs of these stations will be commanded to start data recording.
+            :param mode:  string - Parameter to set-up data recording in either \"subband\" or \"rawvoltage\" mode.
+            """
+            log_message = "Switching TBB firmware on stations %s to \"%s\"" % (stations, mode)
             logger.info(log_message + "...")
             load_tbb_firmware(stations, mode)
             logger.info(log_message + "done.")