Update content/micropython-course/course/05.analog/04.analog.md

Author: jacobhylen

content/micropython-course/course/05.analog/04.analog.md

@@ -13,7 +13,7 @@ Analog signals are used to represent phenomena in the real world, such as pressu
 
 You will learn the following in this chapter:
 - How to read an analog signal,
-- how to control output devices such as LED.
+- how to generate a faux analog output signal using PWM, to fade an LED.
 
 ## Analog Signals