Mailing list archives links update

Greetings!

I've found one more mailing list archive.
I do not have wiki access, so could someone else add one more link?

Wiki page:
https://btrfs.wiki.kernel.org/index.php/Btrfs_mailing_list

Additional archive link:
https://www.spinics.net/lists/linux-btrfs/

Thanks!

I have already added this link for you.

Thanks,
Lu