chore(nodejs): update client ref docs link in metadata (#472)

Author: fhinkel

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

@@ -1,5 +1,5 @@
 {
-  "client_documentation": "https://googleapis.dev/nodejs/oslogin/latest",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/os-login/latest",
   "api_id": "oslogin.googleapis.com",
   "distribution_name": "@google-cloud/os-login",
   "release_level": "ga",

packages/google-cloud-oslogin/README.md

@@ -144,7 +144,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-os-login/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/oslogin/latest
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/os-login/latest
 [product-docs]: https://cloud.google.com/compute/docs/oslogin/
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project