Merge pull request peterhinch#68 from algestam/apoll_doc_fix

apoll.py Minor doc fix Thank you.

Author: peterhinch

v2/apoll.py

@@ -1,4 +1,4 @@
-# Demonstration of a device driver using a coroutine to poll a dvice.
+# Demonstration of a device driver using a coroutine to poll a device.
 # Runs on Pyboard: displays results from the onboard accelerometer.
 # Uses crude filtering to discard noisy data.
 

v3/as_demos/apoll.py

@@ -1,4 +1,4 @@
-# Demonstration of a device driver using a coroutine to poll a dvice.
+# Demonstration of a device driver using a coroutine to poll a device.
 # Runs on Pyboard: displays results from the onboard accelerometer.
 # Uses crude filtering to discard noisy data.