hg: jdk9/sandbox: Let the doctitle of the JDK javadoc output state that it is JDK javadoc.

[magnus.ihse.bursie at oracle.com]

Changeset: 349a2bedcb1f
Author:    ihse
Date:      2017-04-04 13:24 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/349a2bedcb1f

Let the doctitle of the JDK javadoc output state that it is JDK javadoc.

! make/Javadoc.gmk