note to update config yaml

Author: envestcc

changelog/v2.3.3-release-note.md

@@ -8,6 +8,8 @@ v2.3.3 is a major maintenance release that introduces official support for Archi
 There's no change to the mainnet config.yaml and genesis.yaml. You only need to
 restart your node with the new v2.3.3 image.
 
+- Snapshot update: the bundled snapshot no longer contains the legacy `stakingindex`. If your `config.yaml` has `enableStakingIndexer: true`, please remove that entry before starting the node.
+
 ## Key Features and Enhancements
 
 ### 1. Archive Mode Support