Explain in broadcast docstring that broadcast time is N*broadcast_time if split up

Author: tekktrik

adafruit_ble_broadcastnet.py

@@ -35,7 +35,8 @@
 
 def broadcast(measurement: 'AdafruitSensorMeasurement', *, broadcast_time: float = 0.1, extended: bool = False) -> None:
     """Broadcasts the given measurement for the given broadcast time. If extended is False and the
-    measurement would be too long, it will be split into multiple measurements for transmission.
+    measurement would be too long, it will be split into multiple measurements for transmission,
+    each with the given broadcast time.
     """
     global _sequence_number  # pylint: disable=global-statement,invalid-name
     for submeasurement in measurement.split(252 if extended else 31):