Update how-to-apply-acl-to-nni.md

updated the heading

Author: sushantjrao

articles/operator-nexus/how-to-apply-acl-to-nni.md

@@ -9,9 +9,11 @@ ms.date: 04/18/2024
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+# Access Control List (ACL) Management for NNI
+
 In Azure Nexus Network Fabric, maintaining network security is paramount for ensuring a robust and secure infrastructure. Access Control Lists (ACLs) are crucial tools for enforcing network security policies. This guide will lead you through the process of applying ACLs to network-to-network interconnects (NNI) within the Nexus Network Fabric.
 
-### Applying Access Control Lists (ACLs) to NNI in Azure Fabric
+## Applying Access Control Lists (ACLs) to NNI in Azure Fabric
 
 To maintain network security and regulate traffic flow within your Azure Fabric network, applying Access Control Lists (ACLs) to network-to-network interconnects (NNI) is essential. This guide delineates the steps for effectively applying ACLs to NNIs.