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

Documentation/process/2.Process.rst

@@ -405,7 +405,7 @@ be found at:
 	http://vger.kernel.org/vger-lists.html
 
 There are lists hosted elsewhere, though; a number of them are at
-lists.redhat.com.
+redhat.com/mailman/listinfo.
 
 The core mailing list for kernel development is, of course, linux-kernel.
 This list is an intimidating place to be; volume can reach 500 messages per