Fix Tam's comment

Author: NolwennP

content/swagger/resources/reference_entity_attributes/definitions/reference_entity_attribute.yaml

@@ -30,7 +30,7 @@ properties:
     x-immutable: true
   is_required_for_completeness:
     type: boolean
-    description: Whether the attribute should be part of the records completeness calculation
+    description: Whether the attribute should be part of the record's completeness calculation
     default : false
   max_characters:
     type: integer