doc: replace dbus-send's --address with --peer and --bus
The original fix for https://bugs.freedesktop.org/show_bug.cgi?id=48816 didn't include changes to the documentation to match the functional change to dbus-send.
The original fix for https://bugs.freedesktop.org/show_bug.cgi?id=48816 didn't include changes to the documentation to match the functional change to dbus-send.