Add persistent system app string 2

Author: victorhuangwq

microsoft-edge/webview2/release-notes/index.md

@@ -132,7 +132,7 @@ For full API compatibility, this Release version of the WebView2 SDK requires We
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 #### General features
 
-* The Microsoft Edge WebView2 Runtime is no longer listed in Windows **Settings** > **Apps** > **Installed apps**.
+* The Microsoft Edge WebView2 Runtime is no longer listed in Windows **Settings** > **Apps** > **Installed apps** because it is a persistent system component.
 
 
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