remove accidentally added changelog entries

The `help_html` option is neither part of the Twig bridge nor of the
FrameworkBundle. It is provided by the Form component.

Author: xabbuh

CHANGELOG.md

@@ -6,10 +6,7 @@ CHANGELOG
 
  * Not passing the project directory to the constructor of the `AssetsInstallCommand` is deprecated. This argument will
    be mandatory in 5.0.
- * Added `ControllerTrait::isFormValid()`
- * Added an `help_html` form option to display the `help` text as HTML
  * Deprecated the "Psr\SimpleCache\CacheInterface" / "cache.app.simple" service, use "Symfony\Contracts\Cache\CacheInterface" / "cache.app" instead
-
  * [BC Break] When using Messenger, the default transport changed from
    using Symfony's serializer service to use `PhpSerializer`, which uses
    PHP's native `serialize()` and `unserialize()` functions. To use the