Autosave improvements (#1247)

* Autosave improvements

* Update soh/src/code/z_play.c

* Removes a line break in building.md

Co-authored-by: Kenix3 <kenixwhisperwind@gmail.com>

soh/src/code/z_play.c

@@ -2006,4 +2006,7 @@ void Gameplay_PerformSave(GlobalContext* globalCtx) {
     } else {
         Save_SaveFile();
     }
+    if (CVar_GetS32("gAutosave", 0)) {
+        Overlay_DisplayText(3.0f, "Game Saved");
+    }
 }