Fixed the indentation of some code blocks

These code blocks were wrongly rendered as blockquotes inside the `<li>` elements (see http://symfony.com/doc/current/bundles/SensioGeneratorBundle/commands/generate_doctrine_crud.html)
minor #294 Fixed the indentation of some code blocks (javiereguiluz)

This PR was merged into the 2.3.x-dev branch.

Discussion
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Fixed the indentation of some code blocks

These code blocks were wrongly rendered as blockquotes inside the `<li>` elements:

![wrong_codeblocks](https://cloud.githubusercontent.com/assets/73419/3493446/3d7c9526-05b8-11e4-9c3d-04a02ed5ff93.png)

Commits
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8a884d8 Fixed the indentation of some code blocks