Update 06.md (#97)

docs/30DaysOfPWA/advanced-capabilities/06.md

@@ -1,4 +1,4 @@
-# 2.6: Synchronizing app in the background
+# 2.6: Synchronizing app data in the background
 
 **Author: Maxim Salnikov​ [@webmaxru](https://twitter.com/webmaxru)**
 
@@ -167,4 +167,4 @@ In the Background Services section of the Application tab, you can click on the
 
 - [Synchronize and update a PWA in the background](https://aka.ms/learn-PWA/30Days-2.6/docs.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/background-syncs) article on Microsoft Docs
 - Specifications for [Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/wicg.github.io/background-sync/spec) and [Periodic Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/wicg.github.io/periodic-background-sync)
-- API documentation for [Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/developer.mozilla.org/en-US/docs/Web/API/Background_Synchronization_API) and [Periodic Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/developer.mozilla.org/en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API) on Mozilla Developer Network.
+- API documentation for [Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/developer.mozilla.org/en-US/docs/Web/API/Background_Synchronization_API) and [Periodic Background Sync API](https://aka.ms/learn-PWA/30Days-2.6/developer.mozilla.org/en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API) on Mozilla Developer Network.