changelog: add two general notes and fix the typo

Suggested-By: @shesek
Suggested-By: @rustyrussell

Author: niftynei

CHANGELOG.md

@@ -8,9 +8,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 This release named by @nalinbhardwaj.
 
+NOTE ONE: Both the dual-funding and offers protocols have changed, and
+are incompatible with older releses (they're both still draft)
+
+NOTE TWO: `rebalance` and `drain` plugins will need to be redownloaded as
+older versions will no longer work -- `payment_secret` is now compulsory.
+
+
+
 ### Added
 
- - JSON-RPC: `invoice` now outputs explicit `payment_secret` it its own field. ([#4646])
+ - JSON-RPC: `invoice` now outputs explicit `payment_secret` as its own field. ([#4646])
  - JSON-RPC: `listchannels` can be queried by `destination`. ([#4614])
  - JSON-RPC: `invoice` now gives `warning_private_unused` if unused unannounced channels could have provided sufficient capacity. ([#4585])
  - JSON-RPC: `withdraw`, `close` (and others) now accept taproot (and other future) segwit addresses. ([#4591])