xen: arm: remove innaccurate statement about multiboot module path

It is the compatible string which matters, not the absolute path, and in any
case /chosen/module@N is more often used than /chosen/modules/module@N.

Reported-by: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.gral@linaro.org>

docs/misc/arm/device-tree/booting.txt

@@ -4,8 +4,7 @@ Dom0 kernel and ramdisk modules
 Xen is passed the dom0 kernel and initrd via a reference in the /chosen
 node of the device tree.
 
-Each node has the form /chosen/modules/module@<N> and contains the following
-properties:
+Each node contains the following properties:
 
 - compatible