Link index from integration doc

Author: aliu39

docs/platforms/javascript/common/configuration/integrations/featureflags.mdx

@@ -25,7 +25,8 @@ notSupported:
 
 <Alert level="info">
 
-This integration only works inside a browser environment.
+This integration only works inside a browser environment. If you are using a specific
+feature flag provider, refer to the supported list [here](/platforms/javascript/feature-flags/#enable-evaluation-tracking) before setting up this integration.
 
 </Alert>