Update toggle_listening.md

Author: AndreasArvidsson

docs/Customization/Examples/toggle_listening.md

@@ -2,6 +2,8 @@
 
 If you want to completely prevent Talon from listening, so not even the wake up commands are active, you can do that by changing the microphone to `"None"`:
 
+To list available microphone names. Either used the voice command `"microphone show"` or click `Microphone` in the Talon menu.
+
 ```talon
 key(f9):
     sound.set_microphone("None")