hg: jdk/jdk12: 8217892: Clarify the support for the new Japanese era in java.time.chrono.JapaneseEra

[naoto.sato at oracle.com]

Changeset: 125012edb689
Author:    naoto
Date:      2019-01-31 12:43 -0800
URL:       http://hg.openjdk.java.net/jdk/jdk12/rev/125012edb689

8217892: Clarify the support for the new Japanese era in java.time.chrono.JapaneseEra
Reviewed-by: chegar

! src/java.base/share/classes/java/time/chrono/JapaneseEra.java