chore(nodejs): update client ref docs link in metadata (#74)

Author: fhinkel

packages/google-cloud-managedidentities/.repo-metadata.json

@@ -1,5 +1,5 @@
 {
-  "client_documentation": "https://googleapis.dev/nodejs/managedidentities/latest/",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/managed-identities/latest",
   "api_id": "managedidentities.googleapis.com",
   "distribution_name": "@google-cloud/managed-identities",
   "release_level": "GA",

packages/google-cloud-managedidentities/README.md

@@ -149,7 +149,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-managed-identities/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/managedidentities/latest/
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/managed-identities/latest
 [product-docs]: https://cloud.google.com/managed-microsoft-ad/
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project