docs: update release docs

Author: yyforyongyu

docs/release-notes/release-notes-0.20.0.md

@@ -140,6 +140,10 @@ reader of a payment request.
 - [Refactored](https://github.com/lightningnetwork/lnd/pull/10018) `channelLink`
   to improve readability and maintainability of the code.
 
+- Remove unnecessary
+  [disconnect](https://github.com/lightningnetwork/lnd/pull/10031) and properly
+  wait for goroutine to finish when shutting down.
+
 ## Breaking Changes
 ## Performance Improvements