docs: Document ideal iconPath size (#43239)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Felix Rieseberg <[email protected]>

docs/api/app.md

@@ -1354,7 +1354,7 @@ Show the app's about panel options. These options can be overridden with `app.se
   * `credits` string (optional) _macOS_ _Windows_ - Credit information.
   * `authors` string[] (optional) _Linux_ - List of app authors.
   * `website` string (optional) _Linux_ - The app's website.
-  * `iconPath` string (optional) _Linux_ _Windows_ - Path to the app's icon in a JPEG or PNG file format. On Linux, will be shown as 64x64 pixels while retaining aspect ratio.
+  * `iconPath` string (optional) _Linux_ _Windows_ - Path to the app's icon in a JPEG or PNG file format. On Linux, will be shown as 64x64 pixels while retaining aspect ratio. On Windows, a 48x48 PNG will result in the best visual quality.
 
 Set the about panel options. This will override the values defined in the app's `.plist` file on macOS. See the [Apple docs][about-panel-options] for more details. On Linux, values must be set in order to be shown; there are no defaults.