SDL_hints: fix gpu direct3d11 driver name in documentation

This was renamed in b17ca32d8cafbd6a6524f49485208842adca66b8

include/SDL3/SDL_hints.h

@@ -1011,8 +1011,8 @@ extern "C" {
  *
  * By default, SDL will try all available GPU backends in a reasonable order
  * until it finds one that can work, but this hint allows the app or user to
- * force a specific target, such as "d3d11" if, say, your hardware supports
- * D3D12 but want to try using D3D11 instead.
+ * force a specific target, such as "direct3d11" if, say, your hardware
+ * supports D3D12 but want to try using D3D11 instead.
  *
  * This hint should be set before SDL_GPUSelectBackend() is called.
  *