Update TOC.yml

Author: msmbaldwin

articles/security/benchmarks/TOC.yml

@@ -40,6 +40,8 @@
     href: ../../container-registry/security-baseline.md
   - name: Cosmos DB security baseline
     href: ../../cosmos-db/security-baseline.md
+  - name: Event Hubs security baseline
+    href: ../../event-hubs/security-baseline.md
   - name: HDInsight security baseline
     href: ../../hdinsight/security-baseline.md
   - name: Key Vault security baseline