chore: update repo-metadata.json client_documentation link (#122)

.repo-metadata.json

@@ -3,7 +3,7 @@
   "name_pretty": "Database Migration Service",
   "product_documentation": "https://cloud.google.com/database-migration/docs",
   "api_description": "makes it easier for you to migrate your data to Google Cloud. This service helps you lift and shift your MySQL and PostgreSQL workloads into Cloud SQL.",
-  "client_documentation": "https://googleapis.dev/java/google-cloud-dms/latest/index.html",
+  "client_documentation": "https://cloud.google.com/java/docs/reference/google-cloud-dms/latest/history",
   "release_level": "ga",
   "transport": "grpc",
   "language": "java",

README.md

@@ -160,7 +160,7 @@ 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/database-migration/docs
-[javadocs]: https://googleapis.dev/java/google-cloud-dms/latest/index.html
+[javadocs]: https://cloud.google.com/java/docs/reference/google-cloud-dms/latest/history
 [kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-dms/java7.svg
 [kokoro-badge-link-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-dms/java7.html
 [kokoro-badge-image-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-dms/java8.svg