fixed requirement & description for properties

src/schema/submission.yaml

@@ -720,6 +720,7 @@ classes:
  description: >-
  Data use permission associated with a policy. Typically one or more terms from DUO
  and should be descendants of 'DUO:0000001 data use permission'.
+ Please use 'DUO:0000026' if no other permission applies.
  required: true
  data_use_modifiers:
  description: >-