feat: [StorageTransfer] support cross-bucket replication

StorageTransfer/samples/V1/StorageTransferServiceClient/list_transfer_jobs.php

@@ -33,17 +33,32 @@
  * Lists transfer jobs.
  *
  * @param string $filter A list of query parameters specified as JSON text in the form of:
- *                       `{"projectId":"my_project_id",
+ *
+ *                       ```
+ *                       {
+ *                       "projectId":"my_project_id",
  *                       "jobNames":["jobid1","jobid2",...],
- *                       "jobStatuses":["status1","status2",...]}`
+ *                       "jobStatuses":["status1","status2",...],
+ *                       "dataBackend":"QUERY_REPLICATION_CONFIGS",
+ *                       "sourceBucket":"source-bucket-name",
+ *                       "sinkBucket":"sink-bucket-name",
+ *                       }
+ *                       ```
+ *
+ *                       The JSON formatting in the example is for display only; provide the
+ *                       query parameters without spaces or line breaks.
  *
- *                       Since `jobNames` and `jobStatuses` support multiple values, their values
- *                       must be specified with array notation. `projectId` is required.
- *                       `jobNames` and `jobStatuses` are optional.  The valid values for
- *                       `jobStatuses` are case-insensitive:
- *                       [ENABLED][google.storagetransfer.v1.TransferJob.Status.ENABLED],
- *                       [DISABLED][google.storagetransfer.v1.TransferJob.Status.DISABLED], and
- *                       [DELETED][google.storagetransfer.v1.TransferJob.Status.DELETED].
+ *                       * `projectId` is required.
+ *                       * Since `jobNames` and `jobStatuses` support multiple values, their values
+ *                       must be specified with array notation. `jobNames` and `jobStatuses` are
+ *                       optional. Valid values are case-insensitive:
+ *                       * [ENABLED][google.storagetransfer.v1.TransferJob.Status.ENABLED]
+ *                       * [DISABLED][google.storagetransfer.v1.TransferJob.Status.DISABLED]
+ *                       * [DELETED][google.storagetransfer.v1.TransferJob.Status.DELETED]
+ *                       * Specify `"dataBackend":"QUERY_REPLICATION_CONFIGS"` to return a list of
+ *                       cross-bucket replication jobs.
+ *                       * Limit the results to jobs from a particular bucket with `sourceBucket`
+ *                       and/or to a particular bucket with `sinkBucket`.
  */
 function list_transfer_jobs_sample(string $filter): void
 {