A DESCRIPTION OF THE PROBLEM :
The page gives the following example:

Instant oneHourLater = Instant.now().plusHours(1);

This example is incorrect and will not compile. plusHours is not a method for Instant

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Instant oneHourLater = Instant.now().plus(1, ChronoUnit.HOURS);
ACTUAL -
Instant oneHourLater = Instant.now().plusHours(1);

URL OF FAULTY DOCUMENTATION :
https://docs.oracle.com/javase/tutorial/datetime/iso/instant.html