BIP341: replace broken twitter link

The social media account linked to in BIP341 was deleted some time ago:

https://twitter.com/pwuille/status/1108097835365339136

This pull proposes to replace the link with:

https://web.archive.org/web/20220531184542/https://twitter.com/pwuille/status/1108085284862713856

Alex Waltz and I didn't find a web archive of the original tweet (see thread up to https://x.com/raw_avocado/status/1924610087034757158 yesterday) but this one looks like a good replacement -- h/t to Hunter Beast who found it for the BIP360 draft -- and sufficiently good that it seems better than removing the link.

Happy to update if someone does find an archive of the original tweet.