Update release notes

Author: fraVlaca

release_notes/v2.4.0-beta.txt

@@ -3,7 +3,7 @@ v2.4.0
 
 Release Notes
 -------------
-This v2.4.0 Release is a bug fix release of the main branch.
+This v2.4.0-beta Release is a bug fix release of the main branch.
 
 Known Vulnerabilities
 ---------------------
@@ -19,4 +19,4 @@ none
 
 Change Log
 ----------
-https://github.com/hyperledger/fabric-chaincode-java/blob/release-2.x/CHANGELOG.md#v240
+https://github.com/hyperledger/fabric-chaincode-java/blob/release-2.x/CHANGELOG.md#v240