Fix typo in toc.yml

Author: danielrbates

articles/cognitive-services/openai/toc.yml

@@ -46,7 +46,7 @@ items:
       href: ./how-to/fine-tuning.md
     - name: Manage identity
       href: ./how-to/managed-identity.md
-    - name: Use virutal networks
+    - name: Use virtual networks
       href: ../cognitive-services-virtual-networks.md?context=/azure/cognitive-services/openai/context/context
     - name: Use with large datasets
       href: ./how-to/integrate-synapseml.md