Refer to "macOS", not "macOS X". (bevyengine#9704)

# Objective

- Refer to OSes by their correct name.

## Solution

- Do so.

crates/bevy_window/src/window.rs

@@ -149,9 +149,9 @@ pub struct Window {
     ///
     /// ## Platform-specific
     /// - iOS / Android / Web: Unsupported.
-    /// - macOS X: Not working as expected.
+    /// - macOS: Not working as expected.
     ///
-    /// macOS X transparent works with winit out of the box, so this issue might be related to: <https://github.com/gfx-rs/wgpu/issues/687>.
+    /// macOS transparent works with winit out of the box, so this issue might be related to: <https://github.com/gfx-rs/wgpu/issues/687>.
     /// You should also set the window `composite_alpha_mode` to `CompositeAlphaMode::PostMultiplied`.
     pub transparent: bool,
     /// Get/set whether the window is focused.