Add docs for formaction and formmethod attributes #7233
Description
Added in symfony/symfony#20467 and blogged about them in http://symfony.com/blog/new-in-symfony-3-3-added-support-for-formaction-and-formmethod-attributes
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Added in symfony/symfony#20467 and blogged about them in http://symfony.com/blog/new-in-symfony-3-3-added-support-for-formaction-and-formmethod-attributes