Added MOVED-TO-AVM.md for the recently migrated modules (#4538)

* Added MOVED-TO-AVM.md for the Healthcare APIs Workspace

* Update README.md and MOVED-TO-AVM.md for the Application Gateway Web Application Firewall (WAF) Policies module

modules/healthcare-apis/workspace/MOVED-TO-AVM.md

@@ -0,0 +1 @@
+This module has already been migrated to [AVM](https://github.com/Azure/bicep-registry-modules/tree/main/avm/res). Only the AVM version is expected to receive updates / new features. Please do not work on improving this module in [CARML](https://aka.ms/carml).

modules/healthcare-apis/workspace/README.md

@@ -1,5 +1,7 @@
 # Healthcare API Workspaces `[Microsoft.HealthcareApis/workspaces]`
 
+> This module has already been migrated to [AVM](https://github.com/Azure/bicep-registry-modules/tree/main/avm/res). Only the AVM version is expected to receive updates / new features. Please do not work on improving this module in [CARML](https://aka.ms/carml).
+
 This module deploys a Healthcare API Workspace.
 
 ## Navigation

modules/network/application-gateway-web-application-firewall-policy/MOVED-TO-AVM.md

@@ -0,0 +1 @@
+This module has already been migrated to [AVM](https://github.com/Azure/bicep-registry-modules/tree/main/avm/res). Only the AVM version is expected to receive updates / new features. Please do not work on improving this module in [CARML](https://aka.ms/carml).

modules/network/application-gateway-web-application-firewall-policy/README.md

@@ -1,5 +1,7 @@
 # Application Gateway Web Application Firewall (WAF) Policies `[Microsoft.Network/ApplicationGatewayWebApplicationFirewallPolicies]`
 
+> This module has already been migrated to [AVM](https://github.com/Azure/bicep-registry-modules/tree/main/avm/res). Only the AVM version is expected to receive updates / new features. Please do not work on improving this module in [CARML](https://aka.ms/carml).
+
 This module deploys an Application Gateway Web Application Firewall (WAF) Policy.
 
 ## Navigation