chore(nodejs): update client ref docs link in metadata (#18)

.repo-metadata.json

@@ -2,7 +2,7 @@
   "name": "apigateway",
   "name_pretty": "API Gateway",
   "product_documentation": "https://cloud.google.com/api-gateway/",
-  "client_documentation": "https://cloud.google.com/anthos/multicluster-management/gateway/using",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/gke-connect-gateway/latest",
   "issue_tracker": "https://github.com/googleapis/nodejs-gke-connect-gateway/issues",
   "release_level": "BETA",
   "language": "nodejs",
@@ -12,4 +12,3 @@
   "default_version": "v1beta1",
   "requires_billing": true
 }
-

README.md

@@ -132,7 +132,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-gke-connect-gateway/blob/master/LICENSE)
 
-[client-docs]: https://cloud.google.com/anthos/multicluster-management/gateway/using
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/gke-connect-gateway/latest
 [product-docs]: https://cloud.google.com/api-gateway/
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project