Merge pull request #215171 from spelluru/egridauth01019

AuthO -> Auth0

Author: Stacyrch140

articles/event-grid/toc.yml

@@ -278,7 +278,7 @@ items:
         href: onboard-partner.md
       - name: Subscribe to partner events
         href: subscribe-to-partner-events.md
-      - name: AuthO
+      - name: Auth0
         items:
         - name: Subscribe to Auth0 events
           href: auth0-how-to.md