kickstart: update busybox note regarding PARTUUID

As of oe-core c996cabf the default BusyBox configuration supports
PARTUUID, so update the note to reflect this.

(From yocto-docs rev: cfd0498c6a981bcdc4b6bd03cb5f8dd42f0b39fc)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Reviewed-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/kickstart.rst

@@ -54,8 +54,9 @@ must also provide one of the ``--ondrive``, ``--ondisk``, or
 .. note::
 
    The mount program must understand the PARTUUID syntax you use with
-   ``--use-uuid`` and non-root *mountpoint*, including swap. The BusyBox
-   versions of these application are currently excluded.
+   ``--use-uuid`` and non-root *mountpoint*, including swap. The default
+   configuration of BusyBox in OpenEmbedded supports this, but this may
+   be disabled in custom configurations.
 
 Here is an example that uses "/" as the mountpoint. The command uses
 ``--ondisk`` to force the partition onto the ``sdb`` disk::