Adjust documentation on kickstart.mute

docs/kickstart/mute.md

@@ -1,11 +1,13 @@
 # kickstart.mute command to run
 Run the command with stdout and stder outputing to /dev/null.
 Inform it is about to run.
-Returns the command result
+
+When debug flag is enable, does not redirect stdout or stderr to help debugging.
+Returns the command result.
 
 ### Example
 
 ```bash
 $ kickstart.mute id root
-Runnig "id root"
+Running "id root"
 ```