[DOCS] Wrong API example for FluidEmail in changelog

The actual method name is format, not setFormat, that should be
respected by changelog docs.

Resolves: #92732
Releases: master, 10.4
Change-Id: Iaca271783da78440b973b7afcae41ba62bc1b561
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66337
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/core/Documentation/Changelog/10.3/Feature-90266-Fluid-basedTemplatedEmails.rst

@@ -51,7 +51,7 @@ It is possible to use the same API in your custom extension like this:
        ->to('contact@acme.com')
        ->from(new Address('jeremy@acme.com', 'Jeremy'))
        ->subject('TYPO3 loves you - here is why')
-       ->setFormat('html') // only HTML mail
+       ->format('html') // only HTML mail
        ->setTemplate('TipsAndTricks')
        ->assign('mySecretIngredient', 'Tomato and TypoScript');
    GeneralUtility::makeInstance(Mailer::class)->send($email);