Mark BIP 21 as super sceded by BIP 321

TheBlueMatt · TheBlueMatt · commit 1f6b3032d8a7 · 2025-03-28T11:51:28.000Z
diff --git a/bip-0021.mediawiki b/bip-0021.mediawiki
@@ -11,6 +11,12 @@
   Created: 2012-01-29
 </pre>
 
+=Superseded by BIP 321=
+
+This BIP has been superseded and replaced with BIP 321. Please see [[bip-0321.mediawiki|BIP 321]] instead.
+
+=Original BIP=
+
 This BIP is a modification of an earlier [[bip-0020.mediawiki|BIP 0020]] by Luke Dashjr. BIP 0020 was based off an earlier document by Nils Schneider. The alternative payment amounts in BIP 0020 have been removed.
 
 ==Abstract==
