Fix TS doc

Author: keelerm84

packages/shared/akamai-edgeworker-sdk/src/featureStore/index.ts

@@ -95,6 +95,14 @@ export class EdgeFeatureStore implements LDFeatureStore {
 
   // This method is used to retrieve the environment payload from the edge
   // provider. It will cache the payload for the duration of the cacheTtlMs.
+
+
+  /**
+  * This method is used to retrieve the environment payload from the edge
+  * provider. It will cache the payload for the duration of the cacheTtlMs.
+  *
+  * @returns
+  */
   private async _getStorePayload(): Promise<ReturnType<typeof deserializePoll>> {
     let payload = this._cache.get();
     if (payload !== undefined) {