Fixes to Encoder README

Author: dplanella

Adafruit_BBIO/README.md

@@ -1,7 +1,9 @@
-# Adafruit_BBIO.Encoder Class
+# Adafruit_BBIO.Encoder module
 
 Initially based on the [PyBBIO](https://github.com/graycatlabs/PyBBIO/bbio/libraries/RotaryEncoder/rotary_encoder.py) rotary encoder code.
 
+This module enables access to the Beaglebone's enhanced Quadrature Encoder Pulse (eQEP) inputs.
+
 ## Prerequisites
 
 These instructions are based on a 4.4.x Linux kernel.
@@ -70,7 +72,7 @@ $ cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position
 
 Note: alternate pins for eQEP2 (mutually exclusive)
 
-Pins: `P8.11`, `P8.12`
+Pins: `P8.41`, `P8.42`
 
 ```
 $ config-pin P8.41 qep