hg: jdk9/dev/jdk: 8180428: Clarify implementation note in Clock.java to match implementation changes made by JDK-8068730

[daniel.fuchs at oracle.com]

Changeset: 82ab8dec02ae
Author:    dfuchs
Date:      2017-05-23 11:33 +0100
URL:       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/82ab8dec02ae

8180428: Clarify implementation note in Clock.java to match implementation changes made by JDK-8068730
Reviewed-by: dholmes, scolebourne

! src/java.base/share/classes/java/time/Clock.java