Reverted the short array notation

Author: javiereguiluz

security/guard_authentication.rst

@@ -55,7 +55,7 @@ property they use to access their account via the API::
 
         public function getRoles()
         {
-            return ['ROLE_USER'];
+            return array('ROLE_USER');
         }
 
         public function getPassword()
@@ -175,14 +175,14 @@ This requires you to implement six methods::
             }
 
             // What you return here will be passed to getUser() as $credentials
-            return [
+            return array(
                 'token' => $token,
-            ];
+            );
         }
 
         public function getUser($credentials, UserProviderInterface $userProvider)
         {
-            $apiKey = $credentials['token'];
+            $apiKey = $credentials'token'];
 
             // if null, authentication will fail
             // if a User object, checkCredentials() is called
@@ -206,12 +206,12 @@ This requires you to implement six methods::
 
         public function onAuthenticationFailure(Request $request, AuthenticationException $exception)
         {
-            $data = [
+            $data = array(
                 'message' => strtr($exception->getMessageKey(), $exception->getMessageData())
 
                 // or to translate this message
                 // $this->translator->trans($exception->getMessageKey(), $exception->getMessageData())
-            ];
+            );
 
             return new JsonResponse($data, Response::HTTP_FORBIDDEN);
         }
@@ -221,10 +221,10 @@ This requires you to implement six methods::
          */
         public function start(Request $request, AuthenticationException $authException = null)
         {
-            $data = [
+            $data = array(
                 // you might translate this message
                 'message' => 'Authentication Required'
-            ];
+            );
 
             return new JsonResponse($data, Response::HTTP_UNAUTHORIZED);
         }