Merge pull request #2217 from FoamyGuy/pwmio_comment

update comment to reference pwmio instead of pulseio

Author: TheKitty

MetroX_CircuitPython/fading_led/code.py

@@ -6,7 +6,7 @@
 'fading_led.py'.
 
 =================================================
-fades a LED using pulseio's PWM
+fades a LED using pwmio's PWM
 """
 
 import time