hg: openjfx/11-dev/rt: 8231854: Change Mercurial to git in various README files

[johan at lodgon.com]

Changeset: 860b67273f79
Author:    kcr
Date:      2020-01-14 21:05 +0100
URL:       https://hg.openjdk.java.net/openjfx/11-dev/rt/rev/860b67273f79

8231854: Change Mercurial to git in various README files
Reviewed-by: ghb

! modules/javafx.media/src/main/legal/glib.md
! modules/javafx.media/src/main/legal/gstreamer.md
! modules/javafx.web/src/main/legal/webkit.md