Using standard format from docs

Updating the format slightly to match [the docs](https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#schedule) precisely

Author: Chris Raynor

README.md

@@ -25,9 +25,9 @@ on:
     #        ┌───────────── minute (0 - 59)
     #        │ ┌───────────── hour (0 - 23)
     #        │ │ ┌───────────── day of the month (1 - 31)
-    #        │ │ │ ┌───────────── month (1 - 12)
-    #        │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday)
-    #        │ │ │ │ │
+    #        │ │ │ ┌───────────── month (1 - 12 or JAN-DEC)
+    #        │ │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
+    #        │ │ │ │ │                                   
     #        │ │ │ │ │
     #        │ │ │ │ │
     #        * * * * *