Update add-custom-controller.md

[daslicht]

added missing method="setTwig" call

[Isengo1989]

For future reference

Storefront Controller need to have Twig injected in future versions

The twig service will be private with upcoming Symfony 6.0. To resolve this deprecation, a new method setTwig was added to the StorefrontController.
All controllers which extends from StorefrontController need to call this method in the dependency injection definition file (services.xml) to set the Twig instance.
The controllers will work like before until the Symfony 6.0 update will be done, but they will create a deprecation message on each usage.
Below is an example how to add a method call for the service using the XML definition.

Before

<service id="Shopware\Storefront\Controller\AccountPaymentController">
    <call method="setContainer">
        <argument type="service" id="service_container"/>
    </call>
</service>

After

<service id="Shopware\Storefront\Controller\AccountPaymentController">
    <call method="setContainer">
        <argument type="service" id="service_container"/>
    </call>
    <call method="setTwig">
        <argument type="service" id="twig"/>
    </call>
</service>

[Isengo1989]

@daslicht could you add it in # Add Dynamic Content via AJAX Calls as well, so we got it covered for the future 🙂

[Isengo1989]

Please add info to other example

[daslicht]

Please add info to other example

created pull request here #1178

[Isengo1989]

@daslicht ok, that work's as well 🙂

Thanks for the PR 🎉