Fix link format for DNS resolution documentation

Updated link for Application Gateway DNS resolution to use .yml extension.

Author: SebastianClaesson

articles/application-gateway/application-gateway-private-deployment.md

@@ -33,7 +33,7 @@ Application Gateway v2 can now address each of these items to further eliminate
 * DNS resolution via defined resolvers on the virtual network [Learn more](../virtual-network/manage-virtual-network.yml#change-dns-servers), including private link private DNS zones.
 
 >[!Tip]
->[Learn more about Application Gateway DNS resolution](./application-gateway-dns-resolution#gateways-with-private-ip-address-only-networkisolationenabled-true)
+>[Learn more about Application Gateway DNS resolution](./application-gateway-dns-resolution.yml#gateways-with-private-ip-address-only-networkisolationenabled-true)
 
 Each of these features can be configured independently. For example, a public IP address can be used to allow traffic inbound from the Internet and you can define a **_Deny All_** outbound rule in the network security group configuration to prevent data exfiltration.