CHANGELOG: add description for patch 1541

Author: dannywillems

CHANGELOG.md

@@ -40,6 +40,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   dummy values ([#1514](https://github.com/o1-labs/mina-rust/pull/1514))
 - **CI/Documentation**: add a script to check the references to the OCaml code
   ([#1525](https://github.com/o1-labs/mina-rust/pull/1525)).
+- **Ledger**: add tests to verify some properties transaction application
+  should have on the ledger. Also, document the different types of transactions
+  that can be used to modify the ledger
+([#1541](https://github.com/o1-labs/mina-rust/pull/1541))
 
 ### Changed