Rendering yml, xml, php

In some examples of configuration (.. configuration-block::) there is a problem with rendering yml code. For instance:
http://symfony.com/doc/current/book/page_creation.html#application-configuration
(no colors in yml)

[weaverryan]

Hi there!

Yes, you're right! It turns out that if we don't wrap the % in quotes when using YAML, the parser does not render the colors correctly. I've corrected this in most, if not all places.

Thanks!