Typo fix s/ or the new value/, or the new value/
Typo fix s/ or the new value/, or the new value/

As requested by fzaninotto at https://github.com/marmelab/admin-on-rest/pull/368#discussion_r104624007
marmelab/admin-on-rest,marmelab/admin-on-rest,matteolc/admin-on-rest,matteolc/admin-on-rest