minor #5635 Fix minor problems in book/page_creation.rst (fabschurt)

This PR was submitted for the 2.6 branch but it was merged into the 2.3 branch instead (closes #5635).

Discussion
----------

Fix minor problems in book/page_creation.rst

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | >= 2.6
| Fixed tickets | N/A

Commits
-------

5a4a51b Fix minor problems in book/page_creation.rst

Author: xabbuh

book/page_creation.rst

@@ -181,7 +181,7 @@ at the end:
             }
 
             // ...
-        }        
+        }
 
     .. code-block:: yaml
 
@@ -272,7 +272,7 @@ easy, powerful and actually quite fun.
 So far, ``LuckyController`` doesn't extend any base class. The easiest way
 to use Twig - or many other tools in Symfony - is to extend Symfony's base
 :class:`Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller` class::
-    
+
     // src/AppBundle/Controller/LuckyController.php
     // ...
 
@@ -566,9 +566,9 @@ Ok, time to finish mastering the fundamentals by reading these chapters:
 * :doc:`/book/routing`
 * :doc:`/book/templating`
 
-Then, learn about Symfony's :doc:`service container </book/service_container>`
+Then, in the :doc:`Symfony Book </book/index>`, learn about the :doc:`service container </book/service_container>`,
 the :doc:`form system </book/forms>`, using :doc:`Doctrine </book/doctrine>`
-if you need to query a database and more. in the :doc:`Symfony Book </book/index>`.
+(if you need to query a database) and more!
 
 There's also a :doc:`Cookbook </cookbook/index>` *packed* with more advanced
 "how to" articles to solve *a lot* of problems.