can: j1939: fix error in J1939 documentation.

The description of PDU1 format usage mistakenly referred to PDU2 format.

Signed-off-by: Alexander Hölzl <alexander.hoelzl@gmx.net>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20241023145257.82709-1-alexander.hoelzl@gmx.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: xile273

Documentation/networking/j1939.rst

@@ -121,7 +121,7 @@ format, the Group Extension is set in the PS-field.
 
 On the other hand, when using PDU1 format, the PS-field contains a so-called
 Destination Address, which is _not_ part of the PGN. When communicating a PGN
-from user space to kernel (or vice versa) and PDU2 format is used, the PS-field
+from user space to kernel (or vice versa) and PDU1 format is used, the PS-field
 of the PGN shall be set to zero. The Destination Address shall be set
 elsewhere.