[MINOR] add download link for 21.10.1 (#3031)

* add download link for 21.10.1

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

* corrected link and hash

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

CHANGELOG.md

@@ -19,7 +19,7 @@
 - Upgrade CircleCI OpenJDK docker image to version 11.0.12. [#2928](https://github.com/hyperledger/besu/pull/2928)
 - Update JDK 11 to latest version in Besu Docker images. [#2925](https://github.com/hyperledger/besu/pull/2925)
 - Add Sepolia proof-of-work testnet configurations [#2920](https://github.com/hyperledger/besu/pull/2920)
-- Allow block period to be configured for IBFT2 and QBFT using transitions [\#2902](https://github.com/hyperledger/besu/pull/2902)
+- Allow block period to be configured for IBFT2 and QBFT using transitions [#2902](https://github.com/hyperledger/besu/pull/2902)
 - Add support for binary messages (0x02) for websocket. [#2980](https://github.com/hyperledger/besu/pull/2980)
 
 ### Bug Fixes
@@ -30,6 +30,10 @@
 ### Early Access Features
 - Enable plugins to expose custom JSON-RPC / WebSocket methods [#1317](https://github.com/hyperledger/besu/issues/1317)
 
+### Download Link
+https://hyperledger.jfrog.io/artifactory/besu-binaries/besu/21.10.1/besu-21.10.1.zip \
+SHA256: 064df81be49c31ebfc0e1a5f03357e8f6f9a7f5e7bcb82e2b187e2d58e1704eb
+
 ## 21.10.0
 
 ### Additions and Improvements