Correct spelling mistakes.

code/ui/ui_main.c

@@ -5286,7 +5286,7 @@ void _UI_SetActiveMenu( uiMenuCommand_t menu ) {
 	char buf[256];
 
 	// this should be the ONLY way the menu system is brought up
-	// enusure minumum menu data is cached
+	// ensure minimum menu data is cached
   if (Menu_Count() > 0) {
 		vec3_t v;
 		v[0] = v[1] = v[2] = 0;