gpu: Added an initial FAQ to the category documentation.

Fixes #11478.

include/SDL3/SDL_gpu.h

@@ -148,6 +148,17 @@
  * Examples demonstrating proper usage of this API can be found
  * [here](https://github.com/TheSpydog/SDL_gpu_examples)
  * .
+ *
+ * ## FAQ
+ *
+ * - Q: When are you adding more advanced features, like ray tracing or mesh
+ *   shaders?
+ *
+ *   A: We don't have immediate plans to add more bleeding-edge features, but
+ *   we certainly might in the future, when these features prove worthwhile,
+ *   and reasonable to implement across several platforms and underlying APIs.
+ *   So while these things are not in the "never" category, they are definitely
+ *   not "near future" items either.
  */
 
 #ifndef SDL_gpu_h_