docs: fix link to icrc-21

dfinity / wg-identity-authentication

Repository of the Identity and Wallet Standards Working Group

Apache License 2.0

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Closed peterpeterparker closed 1 week ago

peterpeterparker commented 1 week ago

I spotted an invalid link in ICRC-49 to ICRC-21. I guess the latest was maved but, the link was not updated.