minor #1056 Grammar correction (okj579)

This PR was submitted for the master branch but it was merged into the 1.2 branch instead (closes #1056).

Discussion
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Grammar correction

Commits
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29004259 Grammar correction

doc/middlewares.rst

@@ -147,7 +147,7 @@ Short-circuiting the Controller
 -------------------------------
 
 If a before middleware returns a Response object, the Request handling is
-short-circuited (the next middlewares won't be run, neither the route
+short-circuited (the next middlewares won't be run, nor the route
 callback), and the Response is passed to the after middlewares right away::
 
     $app->before(function (Request $request) {