Documentation: ARCnet: Update obsolete contact info

ARCnet docs states that inquiries on the subsystem should be emailed to
Avery Pennarun <[e-mail]>, for whom has been in CREDITS
since the beginning of kernel git history and her email address is
unreachable (bounce). The subsystem is now maintained by Michael
Grzeschik since c38f6ac74c9980 ("MAINTAINERS: add arcnet and take
maintainership").

In addition, there used to be a dedicated ARCnet mailing list but its
archive at epistolary.org has been shut down. ARCnet discussion nowadays
take place in netdev list. The arcnet.com domain mentioned has become
AIoT (Artificial Intelligence of Things) related Typeform page and
ARCnet info now resides on arcnet.cc (ARCnet Resource Center) instead.

Update contact information.

Signed-off-by: Bagas Sanjaya <[e-mail]>
Reviewed-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/networking/arcnet-hardware.rst

···
 ARCnet Hardware
 ===============
 
+:Author: Avery Pennarun <[e-mail]>
+
 .. note::
 
-   1) This file is a supplement to arcnet.txt.  Please read that for general
+   1) This file is a supplement to arcnet.rst.  Please read that for general
       driver configuration help.
    2) This file is no longer Linux-specific.  It should probably be moved out
       of the kernel sources.  Ideas?
 
 Because so many people (myself included) seem to have obtained ARCnet cards
 without manuals, this file contains a quick introduction to ARCnet hardware,
-some cabling tips, and a listing of all jumper settings I can find. Please
-e-mail [e-mail] with any settings for your particular card,
-or any other information you have!
+some cabling tips, and a listing of all jumper settings I can find. If you
+have any settings for your particular card, and/or any other information you
+have, do not hesitate to :ref:`email to netdev <arcnet-netdev>`.
 
 
 Introduction to ARCnet
···
 splitting," that allows "virtual packets" to grow as large as 64K each,
 although they are generally kept down to the Ethernet-style 1500 bytes.
 
-For more information on the advantages and disadvantages (mostly the
-advantages) of ARCnet networks, you might try the "ARCnet Trade Association"
-WWW page:
+For more information on ARCnet networks, visit the "ARCNET Resource Center"
+WWW page at:
 
-	http://www.arcnet.com
+	https://www.arcnet.cc
 
 
 Cabling ARCnet Networks
···
 Other Cards
 ===========
 
-I have no information on other models of ARCnet cards at the moment.  Please
-send any and all info to:
-
-	[e-mail]
+I have no information on other models of ARCnet cards at the moment.
 
 Thanks.

Documentation/networking/arcnet.rst

···
 ARCnet
 ======
 
+:Author: Avery Pennarun <[e-mail]>
+
 .. note::
 
    See also arcnet-hardware.txt in this directory for jumper-setting
···
 
 (hey, that was even better than my original poem... this is getting bad!)
 
-
-.. warning::
-
-   If you don't e-mail me about your success/failure soon, I may be forced to
-   start SINGING.  And we don't want that, do we?
-
-   (You know, it might be argued that I'm pushing this point a little too much.
-   If you think so, why not flame me in a quick little e-mail?  Please also
-   include the type of card(s) you're using, software, size of network, and
-   whether it's working or not.)
-
-   My e-mail address is: [e-mail]
+----
 
 These are the ARCnet drivers for Linux.
 
···
 included and seems to be working fine!
 
 
+.. _arcnet-netdev:
+
 Where do I discuss these drivers?
 ---------------------------------
 
-Tomasz has been so kind as to set up a new and improved mailing list.
-Subscribe by sending a message with the BODY "subscribe linux-arcnet YOUR
-REAL NAME" to [e-mail].  Then, to submit messages to the
-list, mail to [e-mail].
-
-There are archives of the mailing list at:
-
-	http://epistolary.org/mailman/listinfo.cgi/arcnet
-
-The people on [e-mail] (now defunct, replaced by
[e-mail]) have also been known to be very helpful, especially
-when we're talking about ALPHA Linux kernels that may or may not work right
-in the first place.
-
+ARCnet discussions take place on netdev. Simply send your email to
[e-mail] and make sure to Cc: maintainer listed in
+"ARCNET NETWORK LAYER" heading of Documentation/process/maintainers.rst.
 
 Other Drivers and Info
 ----------------------
···
 It works: what now?
 -------------------
 
-Send mail describing your setup, preferably including driver version, kernel
-version, ARCnet card model, CPU type, number of systems on your network, and
-list of software in use to me at the following address:
-
-	[e-mail]
-
-I do send (sometimes automated) replies to all messages I receive.  My email
-can be weird (and also usually gets forwarded all over the place along the
-way to me), so if you don't get a reply within a reasonable time, please
-resend.
-
+Send mail following :ref:`arcnet-netdev`. Describe your setup, preferably
+including driver version, kernel version, ARCnet card model, CPU type, number
+of systems on your network, and list of software in use.
 
 It doesn't work: what now?
 --------------------------