chore(nodejs): update client ref docs link in metadata (#261)

.repo-metadata.json

@@ -4,7 +4,7 @@
   "requires_billing": true,
   "name": "cloudbuild",
   "issue_tracker": "https://issuetracker.google.com/savedsearches/5226584",
-  "client_documentation": "https://googleapis.dev/nodejs/cloudbuild/latest/index.html",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/cloudbuild/latest",
   "language": "nodejs",
   "release_level": "ga",
   "product_documentation": "https://cloud.google.com/cloud-build/docs/",

README.md

@@ -175,7 +175,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-cloudbuild/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/cloudbuild/latest/index.html
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/cloudbuild/latest
 [product-docs]: https://cloud.google.com/cloud-build/docs/
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project