Minor wording

Author: astrofrog

peps/pep-0771.rst

@@ -469,7 +469,8 @@ Packages with multiple kinds of defaults
 In some cases, it may be that packages need multiple kinds of defaults. As an example,
 in `Packages requiring at least one backend or frontend`_, we considered the case of packages
 that have *either* backends or frontends, but in some cases, packages may have to support
-backends *and* frontends, and want to specify a default frontend and a default backend.
+backends *and* frontends, and want to specify one or more default frontend and one or
+more default backend.
 
 Ideally, one may want the following behavior: