Fix documentation links

Signed-off-by: Joshua Li <[email protected]>

README.md

@@ -8,7 +8,7 @@ The OpenSearch Dashboards Visualizations enables you to use additional types of
 
 ## Documentation
 
-Please see our technical [documentation](https://docs-beta.opensearch.org/dashboards/gantt/) to learn more about its features.
+Please see our technical [documentation](https://opensearch.org/docs/dashboards/gantt/) to learn more about its features.
 
 ## Contributing
 
@@ -18,7 +18,7 @@ See [developer guide](DEVELOPER_GUIDE.md) and [how to contribute to this project
 
 If you find a bug, or have a feature request, please don't hesitate to open an issue in this repository.
 
-For more information, see [project website](https://opensearch.org/) and [documentation](https://docs-beta.opensearch.org/). If you need help and are unsure where to open an issue, try [forums](https://discuss.opendistrocommunity.dev/).
+For more information, see [project website](https://opensearch.org/) and [documentation](https://opensearch.org/docs/dashboards/gantt/). If you need help and are unsure where to open an issue, try [forums](https://discuss.opendistrocommunity.dev/).
 
 ## Code of Conduct