net: dlink: fix several spelling mistakes in comments

net: dlink: fix several spelling mistakes in comments

This patch fixes multiple spelling mistakes in dl2k driver comments:

- "deivices" -> "devices"
- "Ttransmit" -> "Transmit"
- "catastronphic" -> "catastrophic"
- "Extened" -> "Extended"

Also fix incorrect unit description: `rx_timeout` uses 640ns increments,
not 64ns.
- "64ns" -> "640ns"

These are comment-only changes and do not affect runtime behavior.

Signed-off-by: Yeounsu Moon <yyyynoom@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251130220652.5425-2-yyyynoom@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>