Merge bitcoin/bitcoin#22718: doc: Add missing PR 16333 release note

fa76ebd doc: Add missing PR 16333 release note (MarcoFalke)

Pull request description:

  Missed in commit ad0fc45

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Tree-SHA512: 5fc9e3f61d2f8534f537cc14c7518d09babd5ebbedd5f24ad10ca9aff69d499f3daa0c45eb548eec94cdbf25bf53c9f0158ec2ee7aa5c3f653f7670c68d1d24c

Author: MarcoFalke

doc/release-notes.md

@@ -108,8 +108,10 @@ RPC
 Tests
 -----
 
-- For the `regtest` network the BIP 66 (DERSIG) activation height was changed
-  from 1251 to 102. (#22632)
+- For the `regtest` network the activation heights of several softforks were
+  changed.
+  * BIP 34 (blockheight in coinbase) from 500 to 2 (#16333)
+  * BIP 66 (DERSIG) from 1251 to 102 (#22632)
 
 Credits
 =======