chore: update repo-metadata.json client_documentation link (#874)

.repo-metadata.json

@@ -3,7 +3,7 @@
   "name_pretty": "Cloud Pub/Sub",
   "api_reference": "https://cloud.google.com/pubsub/",
   "product_documentation": "https://cloud.google.com/pubsub/docs/",
-  "client_documentation": "https://googleapis.dev/java/google-cloud-pubsub/latest/index.html",
+  "client_documentation": "https://cloud.google.com/java/docs/reference/google-cloud-pubsub/latest/history",
   "api_description": "is designed to provide reliable, many-to-many, asynchronous messaging between applications. Publisher applications can send messages to a topic and other applications can subscribe to that topic to receive the messages. By decoupling senders and receivers, Google Cloud Pub/Sub allows developers to communicate between independently written applications.",
   "issue_tracker": "https://issuetracker.google.com/savedsearches/559741",
   "release_level": "ga",

README.md

@@ -376,7 +376,7 @@ Java 11 | [![Kokoro CI][kokoro-badge-image-5]][kokoro-badge-link-5]
 Java is a registered trademark of Oracle and/or its affiliates.
 
 [product-docs]: https://cloud.google.com/pubsub/docs/
-[javadocs]: https://googleapis.dev/java/google-cloud-pubsub/latest/index.html
+[javadocs]: https://cloud.google.com/java/docs/reference/google-cloud-pubsub/latest/history
 [kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-pubsub/java7.svg
 [kokoro-badge-link-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-pubsub/java7.html
 [kokoro-badge-image-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-pubsub/java8.svg