The node has been removed from the texi file some months ago, so we
should remove it from the menu section, too.

Fixes: 27a296fc ("qemu-ga: Convert invocation documentation to rST")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191216132941.25729-1-thuth@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>