small fix

Author: rishiilangomaran

articles/azure-app-configuration/quickstart-feature-flag-aspnet-core.md

@@ -126,7 +126,7 @@ Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/ap
             {
                 var settings = config.Build();
                 config.AddAzureAppConfiguration(settings["ConnectionStrings:AppConfig"])
-                    .UseFeatureFlags();;
+                    .UseFeatureFlags();
             })
             .UseStartup<Startup>();
     ```
@@ -141,7 +141,7 @@ Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/ap
         {
             var settings = config.Build();
             config.AddAzureAppConfiguration(settings["ConnectionStrings:AppConfig"])
-                .UseFeatureFlags();;
+                .UseFeatureFlags();
         })
         .UseStartup<Startup>());
     ```