Updated "see also" references to be more consistent

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

include/SDL3/SDL_clipboard.h

@@ -187,8 +187,7 @@ typedef void (SDLCALL *SDL_ClipboardCleanupCallback)(void *userdata);
  *
  * \since This function is available since SDL 3.0.0.
  *
- * \sa SDL_ClipboardDataCallback
- * \sa SDL_SetClipboardData
+ * \sa SDL_ClearClipboardData
  * \sa SDL_GetClipboardData
  * \sa SDL_HasClipboardData
  */