make sentence less weird. fix #633

Author: dbu

components/routing/dynamic.rst

@@ -201,7 +201,7 @@ for your content in three ways:
 * Or provide an implementation of ``ContentRepositoryInterface`` and pass the id
   of the content object as parameter ``content_id`` and ``null`` as $name.
 
-If you want to implement your own generator for ``$name``s that are not
+If you want to implement your own generator for ``$name`` values that are not
 strings, you need to implement the ``ChainedRouterInterface`` and implement the
 ``supports($name)`` method to tell the ``ChainRouter`` if your router can
 accept this ``$name`` to generate a URL.