Add missing '\param' documentation

include/SDL3/SDL_touch.h

@@ -99,6 +99,7 @@ extern DECLSPEC SDL_TouchID SDLCALL SDL_GetTouchDevice(int index);
  * Get the touch device name as reported from the driver or NULL if the index
  * is invalid.
  *
+ * \param index the touch device index
  * \returns touch device name
  *
  * \since This function is available since SDL 3.0.0.
@@ -108,6 +109,7 @@ extern DECLSPEC const char* SDLCALL SDL_GetTouchName(int index);
 /**
  * Get the type of the given touch device.
  *
+ * \param touchID the ID of a touch device
  * \returns touch device type
  *
  * \since This function is available since SDL 3.0.0.