The JDK API docs [1] has an introductory section, which is missing from the JavaFX 24 API docs [2]. We need to add a similar intro section to the JavaFX API docs.

[1] https://docs.oracle.com/en/java/javase/24/docs/api/index.html
[2] https://download.java.net/java/GA/javafx24/docs/api/index.html