Apply suggestions from code review

Author: JillGrant615

articles/virtual-wan/TOC.yml

@@ -114,9 +114,9 @@
     href: howto-firewall.md
   - name: Integrated NVA in a virtual hub
     items:
-    - name: Create a NVA in a virtual hub
+    - name: Create an NVA in a virtual hub
       href: how-to-nva-hub.md
-    - name: Restart a NVA in a virtual hub
+    - name: Restart an NVA in a virtual hub
       href: how-to-network-virtual-appliance-restart.md
     - name: Configure DNAT/Internet inbound
       href: how-to-network-virtual-appliance-inbound.md