Add missing parameters and return types to SDL2 header docs (#13162)

include/SDL_hidapi.h

@@ -227,6 +227,7 @@ extern DECLSPEC SDL_hid_device * SDLCALL SDL_hid_open(unsigned short vendor_id,
  * platform-specific path name can be used (eg: /dev/hidraw0 on Linux).
  *
  * \param path The path name of the device to open.
+ * \param bExclusive boolean exclusive.
  * \returns a pointer to a SDL_hid_device object on success or NULL on
  *          failure.
  *