Minor docs changes.

chipathlon/workflow_job.py

@@ -516,8 +516,10 @@ class WorkflowJob(object):
                 for file_dict in inputs[arg_value]["values"]:
                     add_value.append(file_dict["file"])
             elif arg_info["type"] in chipathlon.conf.argument_types["file"]:
+                # Need to load from inputs / outputs conditionally
                 add_value = (inputs if arg_value in inputs else outputs)[arg_value]["file"]
             else:
+                # No such thing as argument outputs
                 add_value = inputs[arg_value]["value"]
         return add_value