[Form] Fixed a code example related to CSRF #15441
Merged
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Fixes #15410 but proposes the fix in 5.3 branch because that's where the deprecation was introduced:
https://github.com/symfony/security-csrf/blob/c7b7006d3ed955da978a002d764cae388bed8d09/TokenStorage/SessionTokenStorage.php#L47-L59