minor #2421 Fix codeblock in recipes documentation (aaa2000)
minor #2421 Fix codeblock in recipes documentation (aaa2000)

This PR was submitted for the 2.x branch but it was merged into the 1.x branch instead (closes #2421).

Discussion
----------

Fix codeblock in recipes documentation

Commits
-------

adba4c2a Fix codeblock

nicolas-grekas/Twig,twigphp/Twig,gencer/Twig,twigphp/Twig,gamernetwork/Twig,gamernetwork/Twig,nicolas-grekas/Twig,nicolas-grekas/Twig,gamernetwork/Twig,nicolas-grekas/Twig,twigphp/Twig,nicolas-grekas/Twig,gencer/Twig