document PUT managed/contacts:id response

Author: Steve Szyszkiewicz

src/data/endpoints/managed.yaml

@@ -65,6 +65,7 @@ endpoints:
  curl -H "Authorization: Bearer $TOKEN" \
  https://$api_root/$version/managed/contact/$contact_id
  PUT:
+ response: ManagedContact
  description: >
  Edits this contact.
  examples: