Update databricks-sdk-java/src/main/java/com/databricks/sdk/core/http/RequestOptions.java

Update class description of RequestOptions

Co-authored-by: Renaud Hartert <renaud.hartert@databricks.com>

Author: emmyzhou-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/http/RequestOptions.java

@@ -5,6 +5,8 @@
 /**
  * A builder class for configuring HTTP request transformations including authentication, URL, and
  * user agent headers.
+ *
+ * Experimental: this class is experimental and subject to change in backward incompatible ways. 
  */
 public class RequestOptions {
   private Function<Request, Request> authenticateFunc;