Documentation: process: step 2: Link to email list fixed.

In the past, these email lists where located at lists.redhat.com. This
is not longer the case and they are now at redhat.com/mailman/listinfo

Signed-off-by: Javier Garcia <javier@beren.dev>
Link: https://lore.kernel.org/r/20200901090949.14514-1-javier@beren.dev


Signed-off-by: Jonathan Corbet <corbet@lwn.net>