Rename feature manager variable for clarity

Author: zhiyuanliang-ms

articles/azure-app-configuration/reference-javascript-provider.md

@@ -317,7 +317,7 @@ import { ConfigurationMapFeatureFlagProvider, FeatureManager } from "@microsoft/
 // Create a feature flag provider which uses the configuration provider as feature flag source
 const ffProvider = new ConfigurationMapFeatureFlagProvider(appConfig);
 // Create a feature manager which will evaluate the feature flag
-const fm = new FeatureManager(ffProvider);
+const featureManager = new FeatureManager(ffProvider);
 
 import express from "express";
 const server = express();
@@ -522,4 +522,4 @@ To learn how to use the JavaScript configuration provider, continue to the follo
 To learn how to use the JavaScript feature management library, continue to the following documentation.
 
 > [!div class="nextstepaction"]
-> [JavaScript Feature Management](./feature-management-javascript-reference.md)
+> [JavaScript Feature Management](./feature-management-javascript-reference.md)