Update toc.yml

Acrolinx fix

Author: AnnaMHuff

articles/ai-services/speech-service/toc.yml

@@ -437,7 +437,7 @@ items:
       - name: Use customer-managed keys
         href: speech-encryption-of-data-at-rest.md
         displayName: encrypt, byos
-      - name: How to backup and recover speech customization resources
+      - name: How to back up and recover speech customization resources
         href: resiliency-and-recovery-plan.md
     - name: Logs and diagnostics
       items: