Fix changelog entries (opensearch-project#7946)

Move entry for opensearch-project#7321 to correct section and fix the malformed entry
from opensearch-project#7452.

Signed-off-by: Andrew Ross <[email protected]>

CHANGELOG.md

@@ -60,7 +60,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add ZSTD compression for snapshotting ([#2996](https://github.com/opensearch-project/OpenSearch/pull/2996))
 - Change `com.amazonaws.sdk.ec2MetadataServiceEndpointOverride` to `aws.ec2MetadataServiceEndpoint` ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
 - Change `com.amazonaws.sdk.stsEndpointOverride` to `aws.stsEndpointOverride` ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
-- Compress and cache cluster state during validate join request ([#7321](https://github.com/opensearch-project/OpenSearch/pull/7321))
 
 ### Deprecated
 
@@ -90,7 +89,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Security
 
 ## [Unreleased 2.x]
-### Add TokenManager Interface ([#7452](https://github.com/opensearch-project/OpenSearch/pull/7452))
+### Added
+- Add TokenManager Interface ([#7452](https://github.com/opensearch-project/OpenSearch/pull/7452))
 
 ### Dependencies
 - Bump `jackson` from 2.15.1 to 2.15.2 ([#7897](https://github.com/opensearch-project/OpenSearch/pull/7897))
@@ -99,6 +99,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Changed
 - Replace jboss-annotations-api_1.2_spec with jakarta.annotation-api ([#7836](https://github.com/opensearch-project/OpenSearch/pull/7836))
 - Add min, max, average and thread info to resource stats in tasks API ([#7673](https://github.com/opensearch-project/OpenSearch/pull/7673))
+- Compress and cache cluster state during validate join request ([#7321](https://github.com/opensearch-project/OpenSearch/pull/7321))
 
 ### Deprecated