minor #8394 Page creation article (tiwiex, javiereguiluz)

This PR was merged into the 2.7 branch.

Discussion
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Page creation article

included some clarity on creating the controller bundle. not a syntax error. The step is hidden in the code while the instruction to extend Symfony Controller with the LuckyController.

Commits
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d2ff7d6 Rewords
d89d2b2 added the step to include  "use Symfony\Bundle\FrameworkBundle\Controller\Controller;" before Lucky Controller extends the base controller class. This was mentioned in the code but could easily have been missed as a step. I missed that and didn't realize it was a new line in the code. I think the necessary Framework bundles should all have been listed.
9e9f28e Uncommemted line 10: ** @route("/lucky/number"). I was getting a routing error.

Author: xabbuh

page_creation.rst

@@ -94,7 +94,10 @@ If you're returning HTML from your controller, you'll probably want to render
 a template. Fortunately, Symfony comes with `Twig`_: a templating language that's
 easy, powerful and actually quite fun.
 
-First, make sure that ``LuckyController`` extends Symfony's base
+First, import the Symfony's base
+:class:`Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller` class as shown
+in line 5 below. Then, make sure that ``LuckyController`` extends from it::
+
 :class:`Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller` class::
 
     // src/AppBundle/Controller/LuckyController.php