FULL PRODUCT VERSION :
https://docs.oracle.com/javase/10/docs/api/javafx/scene/input/MouseEvent.html#isSecondaryButtonDown()

ADDITIONAL OS VERSION INFORMATION :
the typo is on the online javadoc
https://docs.oracle.com/javase/10/docs/api/javafx/scene/input/MouseEvent.html#isSecondaryButtonDown()

A DESCRIPTION OF THE PROBLEM :
It is said "Returns true if secondary button (button 1, usually the right)"
whereas it should be "button 3" as said after the return statement "return true if secondary button (button 3, usually the right) is currently pressed "


REPRODUCIBILITY :
This bug can be reproduced always.