Fix comment about MotorControlXX.rxe

Author: schodet

examples/motcont.py

@@ -5,7 +5,8 @@
 
 https://github.com/schodet/MotorControl
 
-Build it and install it with nxc.
+Build it and install it with nxc, or upload the precompiled version (MotorControl22.rxe
+file).
 """
 import time
 

nxt/motcont.py

@@ -180,7 +180,7 @@ def start(self, version=22):
         :param int version: Version to start, default to 22 (version 2.2).
 
         It needs to already be present on the brick's flash and named
-        ``MotorControlXX.rxc``, where `XX` is the version number passed as the version
+        ``MotorControlXX.rxe``, where `XX` is the version number passed as the version
         argument.
         """
         try: