hg: jdk/sandbox: Fix copyright year and Docs.gmk.

[magnus.ihse.bursie at oracle.com]

Changeset: b3b5ec7737f4
Author:    ihse
Date:      2019-03-01 11:57 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/b3b5ec7737f4

Fix copyright year and Docs.gmk.

! make/CreateJmods.gmk
! make/Docs.gmk
! make/Images.gmk
! make/UpdateX11Wrappers.gmk
! make/gensrc/GensrcCommonJdk.gmk
! make/gensrc/GensrcX11Wrappers.gmk
! make/hotspot/gensrc/GensrcDtrace.gmk
! make/hotspot/gensrc/GensrcJfr.gmk
! make/hotspot/gensrc/GensrcJvmti.gmk