Add a link to cromwell configuration file.

website/docs/advanced/build_inputs.md

@@ -72,7 +72,9 @@ This section only applies to the single-sample mode.
 New reference panels can be generated from a single run of the 
 `GATKSVPipelineBatch` workflow. 
 If using a Cromwell server, we recommend copying the outputs to a 
-permanent location by adding the following option to the workflow configuration file:
+permanent location by adding the following option to the 
+[workflow configuration](https://cromwell.readthedocs.io/en/latest/wf_options/Overview/) 
+file:
 
 ```json
 "final_workflow_outputs_dir" : "gs://my-outputs-bucket",