Sync SDL3 wiki -> header

[ci skip]

include/SDL3/SDL_main.h

@@ -41,9 +41,9 @@
  * This is also where an app can be configured to use the main callbacks, via
  * the SDL_MAIN_USE_CALLBACKS macro.
  *
- * SDL_main.h is a "single-header library," which is to say that including this
- * header inserts code into your program, and you should only include it once
- * in most cases. SDL.h does not include this header automatically.
+ * SDL_main.h is a "single-header library," which is to say that including
+ * this header inserts code into your program, and you should only include it
+ * once in most cases. SDL.h does not include this header automatically.
  *
  * For more information, see:
  *