Update cheatsheet.py

Author: anki-code

xontrib/cheatsheet.py

@@ -1,3 +1,4 @@
+"""Cheat sheet for xonsh shell with copy-pastable examples. The best doc for the new users. """
 
 def _cheatsheet():
     import webbrowser
@@ -6,4 +7,4 @@ def _cheatsheet():
     webbrowser.open("https://github.com/anki-code/xonsh-cheatsheet/blob/main/README.md")
 
 aliases['cheatsheet'] = _cheatsheet
-del _cheatsheet
+del _cheatsheet