Merge pull request #248381 from spelluru/relayrest0815

Link to REST API reference

Author: Jill Grant

articles/azure-relay/TOC.yml

@@ -83,6 +83,8 @@
       href: diagnostic-logs.md
 - name: Reference
   items:
+  - name: REST
+    href: /rest/api/relay/
   - name: .NET
     items:
     - name: Microsoft.Azure.Relay