docs: networking: can: change bcm_msg_head frames member to support flexible array

docs: networking: can: change bcm_msg_head frames member to support flexible array

The documentation of the 'bcm_msg_head' struct does not match how
it is defined in 'bcm.h'. Changed the frames member to a flexible array,
matching the definition in the header file.

See commit 94dfc73e7cf4 ("treewide: uapi: Replace zero-length arrays with
flexible-array members")

Signed-off-by: Alex Tran <alex.t.tran@gmail.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://patch.msgid.link/20250904031709.1426895-1-alex.t.tran@gmail.com
Fixes: 94dfc73e7cf4 ("treewide: uapi: Replace zero-length arrays with flexible-array members")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217783
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>