message: add mention of Capacitor's convertFileSrc method
diff: @@ -41,7 +41,13 @@ Cordova and Capacitor apps are hosted on a local HTTP server and are served with
  For Cordova apps, the [Ionic Web View plugin](https://github.com/ionic-team/cordova-plugin-ionic-webview) provides a utility function for converting File URIs: `window.Ionic.WebView.convertFileSrc()`. There is also a corresponding Ionic Native plugin: [`@ionic-native/ionic-webview`](/docs/native/ionic-webview/).
  -For Capacitor apps, the File URIs are converted automatically.
  +For Capacitor apps, converting file URIs is very similar:
  +
  +```javascript
  +import { Capacitor } from '@capacitor/core';
  +
  +Capacitor.convertFileSrc(fileString)
  +```
  ### Implementations
  