Missing backtick, thanks to @Baptouuuu
minor #4212 Missing backtick, thanks to @Baptouuuu (WouterJ)

This PR was merged into the 2.5 branch.

Discussion
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Missing backtick, thanks to @Baptouuuu

See https://github.com/symfony/symfony-docs/pull/4134

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dadaea3 Missing backtick, thanks to @Baptouuuu