Render @link tags in markdown template

[remcotolsma]

Currently the @link tags are not rendered in the markdown template.

/**
 * Prints scripts or data in the head tag on the Adyen checkout page.
 * 
 * This action can be used, for example, to register and print a custom style.
 *
 * See the following link for an example:
 * https://github.com/wp-pay-gateways/adyen#pronamic_pay_adyen_checkout_head
 *
 * @link https://github.com/WordPress/WordPress/blob/5.7/wp-includes/general-template.php#L3004-L3009
 *
 * @since 1.1
 */
do_action( 'pronamic_pay_adyen_checkout_head' );

https://github.com/wp-pay-gateways/adyen/blob/62425e3706d32c63697cd31dbd57ba0894a60118/views/head.php#L8-L19

https://github.com/wp-pay-gateways/adyen/blob/develop/docs/hooks.md#pronamic_pay_adyen_checkout_head