Sync SDL3 wiki -> header

[ci skip]

include/SDL3/SDL_gpu.h

@@ -3755,6 +3755,8 @@ extern SDL_DECLSPEC void SDLCALL SDL_UnmapGPUTransferBuffer(
  * \returns a copy pass handle.
  *
  * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_EndGPUCopyPass
  */
 extern SDL_DECLSPEC SDL_GPUCopyPass * SDLCALL SDL_BeginGPUCopyPass(
     SDL_GPUCommandBuffer *command_buffer);