Fix typos in parse_response_adu() docstring.

Author: acolomb

umodbus/client/serial/rtu.py

@@ -174,9 +174,9 @@ def write_multiple_registers(slave_id, starting_address, values):
 
 def parse_response_adu(resp_adu, req_adu=None):
     """ Parse response ADU and return response data. Some functions require
-    request ADU to fully understand request ADU.
+    request ADU to fully understand response ADU.
 
-    :param resp_adu: Resonse ADU.
+    :param resp_adu: Response ADU.
     :param req_adu: Request ADU, default None.
     :return: Response data.
     """