chore: remove repetitive words (#6730)

Signed-off-by: wellweek <xiezitai@outlook.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>

CHANGELOG.md

@@ -2508,7 +2508,7 @@ Early access features are available features that are not recommended for produc
 have unstable interfaces.
 
 * [Onchain privacy groups](https://besu.hyperledger.org/en/latest/Concepts/Privacy/Onchain-PrivacyGroups/) with add and remove members.
-  Not being able to to re-add a member to an onchain privacy group is a [known issue](https://github.com/hyperledger/besu/issues/455)
+  Not being able to re-add a member to an onchain privacy group is a [known issue](https://github.com/hyperledger/besu/issues/455)
   with the add and remove functionality.
 
 ### Known Issues

datatypes/src/main/java/org/hyperledger/besu/datatypes/Address.java

@@ -188,7 +188,7 @@ public class Address extends DelegatingBytes {
     final Bytes value = Bytes.fromHexString(str);
     checkArgument(
         value.size() == SIZE,
-        "An account address must be be %s bytes long, got %s",
+        "An account address must be %s bytes long, got %s",
         SIZE,
         value.size());
     return new Address(value);