Storage: Link to new XML API docs location (#1114)

Author: tswast

storage/xml-api/README.md

@@ -1,7 +1,10 @@
 java-docs-samples/storage XML API Examples
 ===================================
 
-Samples used in Google Cloud Storage documentation (https://developers.google.com/storage/docs/xml-api-java-samples).
+Samples used in Google Cloud Storage documentation:
+
+- [XML API Overview](https://cloud.google.com/storage/docs/xml-api/overview)
+- [Java samples](https://cloud.google.com/storage/docs/xml-api/java-samples)
 
 - **cmdline-sample** - Uses a [Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials) to access a specified bucket.