Update timezone.py (#8692)

in order to set a timezone, root priviliages are needed on most distros, therefore i suggest to change an example to make it plug and play ready.

plugins/modules/timezone.py

@@ -75,6 +75,7 @@ diff:
 
 EXAMPLES = r'''
 - name: Set timezone to Asia/Tokyo
+  become: true
   community.general.timezone:
     name: Asia/Tokyo
 '''