Adds experimental to feature-flag key

Signed-off-by: Darshit Chanpura <dchanp@amazon.com>

Author: DarshitChanpura

_security/access-control/resources.md

@@ -28,7 +28,7 @@ To enable the resource sharing extension, set up the plugin and permission setti
 To enable resource sharing, add the following settings to `opensearch.yaml`:
 
 ```yaml
-plugins.security.resource_sharing.enabled: true
+plugins.security.experimental.resource_sharing.enabled: true
 plugins.security.system_indices.enabled: true
 ```
 {% include copy.html %}