chore(nodejs): update client ref docs link in metadata (#119)

Author: fhinkel

.repo-metadata.json

@@ -10,6 +10,6 @@
   "product_documentation": "https://cloud.google.com/bigquery/docs/reference/bigqueryconnection",
   "codeowner_team": "@googleapis/api-bigquery",
   "name_pretty": "Google BigQuery Connection",
-  "client_documentation": "https://googleapis.dev/nodejs/bigqueryconnection/latest",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/bigquery-connection/latest",
   "release_level": "ga"
 }

README.md

@@ -153,7 +153,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-bigquery-connection/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/bigqueryconnection/latest
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/bigquery-connection/latest
 [product-docs]: https://cloud.google.com/bigquery/docs/reference/bigqueryconnection
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project