docs: networking: convert arcnet-hardware.txt to ReST

- add SPDX header;
- add document title markup;
- add notes markups;
- mark tables as such;
- mark code blocks and literals as such;
- adjust identation, whitespaces and blank lines;
- add to networking/index.rst.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/index.rst

@@ -39,6 +39,7 @@ Contents:
    6lowpan
    6pack
    altera_tse
+   arcnet-hardware
 
 .. only::  subproject and html