Fixed underline in documentation

Author: Daniel Pollard

shared-bindings/countio/Counter.c

@@ -12,13 +12,13 @@
 //| .. currentmodule:: countio
 //|
 //| :class:`Counter` -- Track the count of falling edge transistions (pulses) on a given pin
-//| ====================================================================================
+//| ========================================================================================
 //|
 //| Counter will keep track of the number of falling edge transistions (pulses) on a given pin
 //|
 //| .. class:: Counter(pin_a)
 //|
-//|   Create an Counter object associated with the given pin. It tracks the number of 
+//|   Create a Counter object associated with the given pin. It tracks the number of 
 //|   falling pulses relative when the object is constructed.
 //|
 //|   :param ~microcontroller.Pin pin_a: Pin to read pulses from.