typo (bevyengine#11955)

the good ol the good ol typo

# Objective

fix a typo

## Solution

remove one of the repeated instances :D

crates/bevy_window/src/window.rs

@@ -243,7 +243,7 @@ pub struct Window {
     pub window_theme: Option<WindowTheme>,
     /// Sets the window's visibility.
     ///
-    /// If `false`, this will hide the window the window completely, it won't appear on the screen or in the task bar.
+    /// If `false`, this will hide the window completely, it won't appear on the screen or in the task bar.
     /// If `true`, this will show the window.
     /// Note that this doesn't change its focused or minimized state.
     ///