fix(docs): move to new client docs URL (googleapis#32)

.repo-metadata.json

@@ -2,12 +2,12 @@
  "name": "recaptcha-enterprise",
  "name_pretty": "Google Cloud reCAPTCHA Enterprise",
  "product_documentation": "https://cloud.google.com/recaptcha-enterprise/docs/",
- "client_documentation": "https://cloud.google.com/nodejs/docs/reference/recaptcha-enterprise/latest/",
+ "client_documentation": "https://googleapis.dev/nodejs/recaptcha-enterprise/latest",
  "issue_tracker": "",
  "release_level": "alpha",
  "language": "nodejs",
  "repo": "googleapis/nodejs-recaptcha-enterprise",
  "distribution_name": "@google-cloud/recaptcha-enterprise",
  "api_id": "recaptchaenterprise.googleapis.com",
  "requires_billing": true
-}
+}

README.md

@@ -125,7 +125,7 @@ Apache Version 2.0
 
 See [LICENSE](https://github.com/googleapis/nodejs-recaptcha-enterprise/blob/master/LICENSE)
 
-[client-docs]: https://cloud.google.com/nodejs/docs/reference/recaptcha-enterprise/latest/
+[client-docs]: https://googleapis.dev/nodejs/recaptcha-enterprise/latest
 [product-docs]: https://cloud.google.com/recaptcha-enterprise/docs/
 [shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
 [projects]: https://console.cloud.google.com/project