[PATCH]: can: Add documentation for virtual CAN driver usage

From: Oliver Hartkopp <redacted>

This patch adds a usage documentation for the virtual CAN driver (vcan).

Signed-off-by: Oliver Hartkopp <redacted>
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Hello Dave,

the virtual CAN netdevices are created via the netlink interface since 
Kerenel 2.6.24.
This patch adds some examples how to create and remove vcans via the 
ip(8) tool.
Please consider for net-next-2.6

Thanks,
Oliver