Affirmative statement for grab mode documentation, rather than negative

Co-authored-by: Alice Cecile <[email protected]>

Author: Aceeri

crates/bevy_window/src/window.rs

@@ -270,7 +270,7 @@ pub enum WindowCommand {
 /// Defines how the cursor is grabbed.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum CursorGrabMode {
-    /// No grabbing of the cursor is performed
+    /// The cursor can freely leave the window
     None,
     /// The cursor is confined to the window area.
     Confined,