chore(nodejs): update client ref docs link in metadata (#936)

Author: fhinkel

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

@@ -3,7 +3,7 @@
   "distribution_name": "@google-cloud/vision",
   "product_documentation": "https://cloud.google.com/vision",
   "api_id": "vision.googleapis.com",
-  "client_documentation": "https://googleapis.dev/nodejs/vision/latest",
+  "client_documentation": "https://cloud.google.com/nodejs/docs/reference/vision/latest",
   "repo": "googleapis/nodejs-vision",
   "release_level": "ga",
   "requires_billing": true,

packages/google-cloud-vision/README.md

@@ -156,7 +156,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-vision/blob/master/LICENSE)
 
-[client-docs]: https://googleapis.dev/nodejs/vision/latest
+[client-docs]: https://cloud.google.com/nodejs/docs/reference/vision/latest
 [product-docs]: https://cloud.google.com/vision
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project