Add missing '\param' documentation

include/SDL3/SDL_metal.h

@@ -58,6 +58,7 @@ typedef void *SDL_MetalView;
  * The returned handle can be casted directly to a NSView or UIView. To access
  * the backing CAMetalLayer, call SDL_Metal_GetLayer().
  *
+ * \param window the window
  * \returns handle NSView or UIView
  *
  * \since This function is available since SDL 3.0.0.
@@ -73,6 +74,8 @@ extern DECLSPEC SDL_MetalView SDLCALL SDL_Metal_CreateView(SDL_Window * window);
  * This should be called before SDL_DestroyWindow, if SDL_Metal_CreateView was
  * called after SDL_CreateWindow.
  *
+ * \param view the view
+ *
  * \since This function is available since SDL 3.0.0.
  *
  * \sa SDL_Metal_CreateView
@@ -82,6 +85,7 @@ extern DECLSPEC void SDLCALL SDL_Metal_DestroyView(SDL_MetalView view);
 /**
  * Get a pointer to the backing CAMetalLayer for the given view.
  *
+ * \param view the view
  * \returns a pointer
  *
  * \since This function is available since SDL 3.0.0.