chore(nodejs): update client ref docs link in metadata (#591)

Author: fhinkel

.repo-metadata.json

@@ -2,7 +2,7 @@
   "name": "error-reporting",
   "name_pretty": "Cloud Error Reporting",
   "product_documentation": "https://cloud.google.com/error-reporting",
-  "client_documentation": "https://googleapis.dev/nodejs/error-reporting/latest/",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/error-reporting/latest",
   "issue_tracker": "https://issuetracker.google.com/savedsearches/559780",
   "release_level": "beta",
   "language": "nodejs",

README.md

@@ -420,7 +420,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-error-reporting/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/error-reporting/latest/
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/error-reporting/latest
 [product-docs]: https://cloud.google.com/error-reporting
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project