Add additional information to docstring

Author: mkhorton

atomate/vasp/workflows/base/magnetism.py

@@ -234,7 +234,9 @@ def get_wf(
         def _add_metadata(structure):
             """
             For book-keeping, store useful metadata with the Structure
-            object for later database ingestion.
+            object for later database ingestion including workflow
+            version and a UUID for easier querying of all tasks generated
+            from the workflow.
 
             Args:
                 structure: Structure