git: openjdk/jdk: 8256993: Clarify Package::isSealed javadoc about package sealing vs sealed class or interface

[Mandy Chung]

Changeset: 3c230b8a
Author:    Mandy Chung <mchung at openjdk.org>
Date:      2020-11-24 21:18:46 +0000
URL:       https://github.com/openjdk/jdk/commit/3c230b8a

8256993: Clarify Package::isSealed javadoc about package sealing vs sealed class or interface

Reviewed-by: alanb

! src/java.base/share/classes/java/lang/Package.java