docs: note how to clear an aspect ratio (#37086)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

docs/api/browser-window.md

@@ -1036,6 +1036,8 @@ height areas you have within the overall content view.
 The aspect ratio is not respected when window is resized programmatically with
 APIs like `win.setSize`.
 
+To reset an aspect ratio, pass 0 as the `aspectRatio` value: `win.setAspectRatio(0)`.
+
 #### `win.setBackgroundColor(backgroundColor)`
 
 * `backgroundColor` string - Color in Hex, RGB, RGBA, HSL, HSLA or named CSS color format. The alpha channel is optional for the hex type.