Fix missing part of sentence to make more sense
+If any UID requested by the client in any of the 'before-id', 'after-id' or 'ids' form fields, the server MUST return an item-not-found error in response to the query.
+If any UID requested by the client in any of the 'before-id', 'after-id' or 'ids' form fields is not present in the archive, the server MUST return an item-not-found error in response to the query.