[Chore] Update changelog for #2695

Signed-off-by: Josh Romero <rmerqg@amazon.com>

CHANGELOG.md

@@ -48,15 +48,17 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Multi DataSource] Address UX comments on index pattern management stack ([#2611](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2611))
 - [Multi DataSource] Apply get indices error handling in step index pattern ([#2652](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2652))
 - [Vis Builder] Last Updated Timestamp for visbuilder savedobject is getting Generated ([#2628](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2628))
-- Removed Leftover X Pack references ([#2638](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2638)) 
+- Removed Leftover X Pack references ([#2638](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2638))
 
 ### 🚞 Infrastructure
 
 - Add CHANGELOG.md and related workflows ([#2414](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2414))
 
 ### 📝 Documentation
 
-* [MD] Add design documents of multiple data source feature [#2538](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2538)
+- [MD] Add design documents of multiple data source feature [#2538](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2538)
+- Add `DEVELOPER_GUIDE.md` and more details to `README.md` of `charts` plugin ([#2695](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2695))
+
 ### 🛠 Maintenance
 
 - Adding @zhongnansu as maintainer. ([#2590](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2590))