hints: Correct the cursor DPI scaling hint

Support for this hint was removed from Wayland shortly after it was added, but the documentation was never updated to reflect this.

(cherry picked from commit 76aa12701a5f0166c1b0cec038ea97759a098b07)

include/SDL3/SDL_hints.h

@@ -2772,7 +2772,7 @@ extern "C" {
  *   (default)
  * - "1": Cursors will automatically match the display content scale (e.g. a
  *   2x sized cursor will be used when the window is on a monitor with 200%
- *   scale). This is currently implemented on Windows and Wayland.
+ *   scale). This is currently implemented on Windows.
  *
  * This hint needs to be set before creating cursors.
  *