Sync SDL3 wiki -> header

[ci skip]

include/SDL3/SDL_gpu.h

@@ -206,8 +206,10 @@
  * underlying graphics API. While it's possible that we have done something
  * inefficiently, it's very unlikely especially if you are relatively
  * inexperienced with GPU rendering. Please see the performance tips above and
- * make sure you are following them. Additionally, tools like RenderDoc can be
- * very helpful for diagnosing incorrect behavior and performance issues.
+ * make sure you are following them. Additionally, tools like
+ * [RenderDoc](https://renderdoc.org/)
+ * can be very helpful for diagnosing incorrect behavior and performance
+ * issues.
  *
  * ## System Requirements
  *
@@ -333,6 +335,39 @@
  * unreferenced data in a bound resource without cycling, but overwriting a
  * section of data that has already been referenced will produce unexpected
  * results.
+ *
+ * ## Debugging
+ *
+ * At some point of your GPU journey, you will probably encounter issues that
+ * are not traceable with regular debugger - for example, your code compiles
+ * but you get an empty screen, or your shader fails in runtime.
+ *
+ * For debugging such cases, there are tools that allow visually inspecting
+ * the whole GPU frame, every drawcall, every bound resource, memory buffers,
+ * etc. They are the following, per platform:
+ *
+ * * For Windows/Linux, use
+ *   [RenderDoc](https://renderdoc.org/)
+ * * For MacOS (Metal), use Xcode built-in debugger (Open XCode, go to Debug >
+ *   Debug Executable..., select your application, set "GPU Frame Capture" to
+ *   "Metal" in scheme "Options" window, run your app, and click the small
+ *   Metal icon on the bottom to capture a frame)
+ *
+ * Aside from that, you may want to enable additional debug layers to receive
+ * more detailed error messages, based on your GPU backend:
+ *
+ * * For D3D12, the debug layer is an optional feature that can be installed
+ *   via "Windows Settings -> System -> Optional features" and adding the
+ *   "Graphics Tools" optional feature.
+ * * For Vulkan, you will need to install Vulkan SDK on Windows, and on Linux,
+ *   you usually have some sort of `vulkan-validation-layers` system package
+ *   that should be installed.
+ * * For Metal, it should be enough just to run the application from XCode to
+ *   receive detailed errors or warnings in the output.
+ *
+ * Don't hesitate to use tools as RenderDoc when encountering runtime issues
+ * or unexpected output on screen, quick GPU frame inspection can usually help
+ * you fix the majority of such problems.
  */
 
 #ifndef SDL_gpu_h_