[Doc] Use Markdown syntax highlighting#12053

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lologhi wants to merge 7 commits intosymfony:2.3from

lologhi:2.3

Commits on Sep 26, 2014

Commits on Sep 27, 2014

Github syntax highlighting for components ReadMe
lologhi
committed

Commits on Sep 28, 2014

Commits on Sep 29, 2014

Replace ```twig in ```jinja to get highlighting
lologhi
committed