Problem/Motivation
In the core.api.php this is mentioned: "Events are part of the Symfony framework". While this on it's own is true, I think it would be better to change it to "Events are part of the Symfony Http Kernel" instead as Drupal is not using the Framework but rather the components and it is less confusing.
Steps to reproduce
Proposed resolution
Use phrases such as "Symfony routing system" and "Symfony event system" and "Symfony components" instead of Symfony Framewoek.