git: openjdk/jfx: 8231854: Change Mercurial to git in various README files

[duke]

Changeset: c6eb0918
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2019-10-04 12:59:35 +0000
URL:       https://git.openjdk.java.net/jfx/commit/c6eb0918

8231854: Change Mercurial to git in various README files

Reviewed-by: ghb

! apps/samples/Ensemble8/UPDATING-lucene.txt
! modules/javafx.media/src/main/legal/glib.md
! modules/javafx.media/src/main/legal/gstreamer.md
! modules/javafx.web/src/main/legal/webkit.md