Clang-Tidy fixes (#6725)

(cherry picked from commit 3c501b963d)

include/SDL_surface.h

@@ -683,7 +683,7 @@ extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
  * it might be easier to call but it doesn't have access to palette
  * information for the destination surface, in case that would be important.
  *
- * \param src the existing SDL_Surface structure to convert
+ * \param surface the existing SDL_Surface structure to convert
  * \param pixel_format the SDL_PixelFormatEnum that the new surface is
  *                     optimized for
  * \param flags the flags are unused and should be set to 0; this is a