Update linkchecker waf url (#1208)

* Update linkchecker.yml

Update with new waf endpoint name

Author: nginx-aoife

.github/workflows/linkchecker.yml

@@ -53,7 +53,7 @@ jobs:
           - nginx-instance-manager
           - solutions
           - nginx-app-protect-dos
-          - nginx-app-protect-waf
+          - waf
           - nginx-ingress-controller
           - nginxaas/azure
           - nginx-service-mesh