fix(docs): move to new client docs URL (#514)

Author: Benjamin E. Coe

.repo-metadata.json

@@ -2,12 +2,12 @@
   "name": "logging",
   "name_pretty": "Stackdriver Logging",
   "product_documentation": "https://cloud.google.com/logging/docs",
-  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/logging/latest/",
+  "client_documentation": "https://googleapis.dev/nodejs/logging/latest",
   "issue_tracker": "https://issuetracker.google.com/savedsearches/559764",
   "release_level": "ga",
   "language": "nodejs",
   "repo": "googleapis/nodejs-logging",
   "distribution_name": "@google-cloud/logging",
   "api_id": "logging.googleapis.com",
   "requires_billing": true
-}
+}

README.md

@@ -135,7 +135,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-logging/blob/master/LICENSE)
 
-[client-docs]: https://cloud.google.com/nodejs/docs/reference/logging/latest/
+[client-docs]: https://googleapis.dev/nodejs/logging/latest
 [product-docs]: https://cloud.google.com/logging/docs
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project