message: update webview - clarify variable
diff: @@ -46,7 +46,7 @@ For Capacitor apps, converting file URIs is very similar:
  ```javascript
  import { Capacitor } from '@capacitor/core';
  -Capacitor.convertFileSrc(fileString)
  +Capacitor.convertFileSrc(filePath);
  ```
  ### Implementations
  