OSM: Update OSM integration with Ingress docs

This commit updates the ingress documentation for OSM.

Signed-off-by: Sneha Chhabria <[email protected]>

Author: snehachhabria

articles/aks/TOC.yml

@@ -386,9 +386,7 @@
                   href: open-service-mesh-deploy-new-application.md
                 - name: Manage an existing application deployment
                   href: open-service-mesh-deploy-existing-application.md
-                - name: Using Azure Application Gateway Ingress
-                  href: open-service-mesh-azure-application-gateway-ingress.md
-                - name: Using NGINX Ingress
+                - name: Using Kubernetes Nginx Ingress Controller
                   href: open-service-mesh-nginx-ingress.md
                 - name: Configure observability using Prometheus, Grafana, and Jaeger
                   href: open-service-mesh-open-source-observability.md