Updated "see also" references to be more consistent

Fixes https://github.com/libsdl-org/SDL/issues/9282

include/SDL3/SDL_atomic.h

@@ -283,8 +283,6 @@ typedef struct SDL_AtomicInt { int value; } SDL_AtomicInt;
  * \since This function is available since SDL 3.0.0.
  *
  * \sa SDL_AtomicCompareAndSwapPointer
- * \sa SDL_AtomicGet
- * \sa SDL_AtomicSet
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareAndSwap(SDL_AtomicInt *a, int oldval, int newval);