better explanation text (#21756)

Author: Chubbygummibear

tgui/packages/tgui/interfaces/PreferencesMenu/preferences/features/game_preferences/multiz_performance.tsx

@@ -1,13 +1,17 @@
+import { multiline } from 'common/string';
 import { createDropdownInput, Feature } from '../base';
 
 export const multiz_performance: Feature<number> = {
   name: 'Multi-Z Detail',
   category: 'GAMEPLAY',
-  description: 'How detailed multi-z is. Lower this to improve performance',
+  description: multiline`
+    How many Z-levels should be rendered when peering through open space.
+    Lowering this value will improve game performance.
+  `,
   component: createDropdownInput({
-    [-1]: 'Standard',
-    2: 'High',
-    1: 'Medium',
-    0: 'Low',
+    [-1]: 'Server Default: Uncapped',
+    2: 'High: 2 z-levels',
+    1: 'Medium: 1 z-level',
+    0: 'Low: None',
   }),
 };