Sync SDL3 wiki -> header

[ci skip]

docs/README-documentation-rules.md

@@ -321,6 +321,11 @@ to the headers:
 - "Version"
 - "See Also"
 
+## Unrecognized sections are removed from the headers!
+
+If you add Doxygen with a `##` (`###`, etc) section header, it'll
+migrate to the wiki and be _removed_ from the headers. Generally
+the correct thing to do is _never use section headers in the Doxygen_.
 
 ## It's okay to repeat yourself.
 

include/SDL3/SDL_gpu.h

@@ -4305,3 +4305,6 @@ extern SDL_DECLSPEC void SDLCALL SDL_GDKResumeGPU(SDL_GPUDevice *device);
 #endif /* SDL_gpu_h_ */
 
 
+
+
+