moved experimental features (#2771)

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>

CHANGELOG.md

@@ -2,8 +2,6 @@
 
 ## 21.7.4
 ### Additions and Improvements
-- \[EXPERIMENTAL\] Added support for QBFT with PKI-backed Block Creation. [#2647](https://github.com/hyperledger/besu/issues/2647)
-- Added support for QBFT to use retrieve validators from a smart contract [#2574](https://github.com/hyperledger/besu/pull/2574)
 - Upgrade Gradle to 7.2, which supports building with Java 17 [#2761](https://github.com/hyperledger/besu/pull/2376) 
 
 ### Bug Fixes
@@ -12,6 +10,8 @@
 - Update Gas Schedule for Ethereum Classic [#2746](https://github.com/hyperledger/besu/pull/2746)
 
 ### Early Access Features
+- \[EXPERIMENTAL\] Added support for QBFT with PKI-backed Block Creation. [#2647](https://github.com/hyperledger/besu/issues/2647)
+- \[EXPERIMENTAL\] Added support for QBFT to use retrieve validators from a smart contract [#2574](https://github.com/hyperledger/besu/pull/2574)
 
 ## 21.7.3
 ### Additions and Improvements