Add missing \returns, change "return" to "returns" to have same naming

include/SDL3/SDL_touch.h

@@ -99,6 +99,8 @@ 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.
  *
+ * \returns touch device name
+ *
  * \since This function is available since SDL 3.0.0.
  */
 extern DECLSPEC const char* SDLCALL SDL_GetTouchName(int index);
@@ -106,6 +108,8 @@ extern DECLSPEC const char* SDLCALL SDL_GetTouchName(int index);
 /**
  * Get the type of the given touch device.
  *
+ * \returns touch device type
+ *
  * \since This function is available since SDL 3.0.0.
  */
 extern DECLSPEC SDL_TouchDeviceType SDLCALL SDL_GetTouchDeviceType(SDL_TouchID touchID);