Update v2.2.0-release-note.md

Author: CoderZhi

changelog/v2.2.0-release-note.md

@@ -11,7 +11,7 @@ not being able to sync with the IoTeX blockchain after other nodes have upgraded
 There's no change to the mainnet config.yaml and genesis.yaml. You only need to
 restart your node with the new v2.2.0 image.
 
-This release reduces the block interval from 5 seconds to 2.5 seconds, effectively doubling the block production rate. This improvement enhances overall network responsiveness, and reduces transaction confirmation times. Users and developers can expect faster feedback for submitted transactions and more frequent block updates across the network. System Staking Contract Version 3 is introduced, which is optimized for the new 2.5-second block interval. It replaces Version 2, which is now deprecated. It will remain compatible even if the block interval changes again in the future.
+This release enables [IIP-42](https://github.com/iotexproject/iips/blob/master/iip-42.md). It reduces the block interval from 5 seconds to 2.5 seconds, effectively doubling the block production rate. This improvement enhances overall network responsiveness, and reduces transaction confirmation times. Users and developers can expect faster feedback for submitted transactions and more frequent block updates across the network. System Staking Contract Version 3 is introduced, which is optimized for the new 2.5-second block interval. It replaces Version 2, which is now deprecated. It will remain compatible even if the block interval changes again in the future.
 
 ## Key Features and Enhancements
 
@@ -34,4 +34,4 @@ syncing with the IoTeX blockchain
 | API node   | Must upgrade |
 
 ## Commits
-https://github.com/iotexproject/iotex-core/compare/v2.1.2...v2.2.0
+https://github.com/iotexproject/iotex-core/compare/v2.1.2...v2.2.0