Fix typo in window.rs (bevyengine#10358)

# Objective

Fixes a small typo in `bevy_window/src/window.rs`

## Solution

Change `Should be used instead 'scale_factor' when set.` to `Should be
used instead of 'scale_factor' when set.`

crates/bevy_window/src/window.rs

@@ -589,7 +589,7 @@ pub struct WindowResolution {
     physical_height: u32,
     /// Code-provided ratio of physical size to logical size.
     ///
-    /// Should be used instead `scale_factor` when set.
+    /// Should be used instead of `scale_factor` when set.
     scale_factor_override: Option<f64>,
     /// OS-provided ratio of physical size to logical size.
     ///