docs: change to ordered list

Author: peaceiris

README.md

@@ -308,9 +308,9 @@ jobs:
 
 Scenario:
 
-- Someone updates the README.md and opens a pull-request.
-- actions/labeler adds the documentation label automatically.
-- peaceiris/actions-label-commenter creates the template comment automatically.
+1. Someone updates the README.md and opens a pull-request.
+1. actions/labeler adds the documentation label automatically.
+1. peaceiris/actions-label-commenter creates the template comment automatically.
 
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