minor symfony#11248 [Console] uncomment the "Before" code part (Oskar…

…Stark)

This PR was merged into the 3.4 branch.

Discussion
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[Console] uncomment the "Before" code part

for better syntax highlighting

The current version:
![Screenshot 2019-03-29 10 58 30](https://user-images.githubusercontent.com/995707/55224862-a48aeb00-5211-11e9-8139-e7bac0f566c8.png)

Commits
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a9fc18a uncomment the "Before" code part

console/style.rst

@@ -365,10 +365,11 @@ of your commands to change their appearance::
         protected function execute(InputInterface $input, OutputInterface $output)
         {
             // Before
-            // $io = new SymfonyStyle($input, $output);
+            $io = new SymfonyStyle($input, $output);
 
             // After
             $io = new CustomStyle($input, $output);
+
             // ...
         }
     }