quick TOC fix

Author: spelluru

articles/event-grid/toc.yml

@@ -138,7 +138,7 @@
       href: partner-topics-overview.md
     - name: Auth0
       href: auth0-overview.md
-    - name: Become and Event Grid Partner
+    - name: Become an Event Grid Partner
       href: partner-onboarding-overview.md
   - name: Event Domains
     href: event-domains.md