More unreferenced labels cleanup

engine/intro_menu.asm

@@ -10,7 +10,7 @@ _MainMenu: ; 5ae8
 	jp StartTitleScreen
 ; 5b04
 
-; unreferenced
+; unused
 	ret
 ; 5b05
 
@@ -827,7 +827,7 @@ NamePlayer: ; 0x6074
 	db "KRIS@@@@@@@"
 ; 60e9
 
-Function60e9: ; Unreferenced
+Unreferenced_Function60e9:
 	call LoadMenuDataHeader
 	call VerticalMenu
 	ld a, [wMenuCursorY]
@@ -1094,7 +1094,7 @@ RunTitleScreen: ; 627b
 	ret
 ; 6292
 
-Function6292: ; 6292 ; unreferenced
+Unreferenced_Function6292: ; 6292
 	ld a, [hVBlankCounter]
 	and $7
 	ret nz
@@ -1125,7 +1125,7 @@ TitleScreenScene: ; 62a3
 	dw TitleScreenEnd
 ; 62b7
 
-.NextScene: ; Unreferenced
+.Unreferenced_NextScene:
 	ld hl, wJumptableIndex
 	inc [hl]
 	ret
@@ -1329,7 +1329,7 @@ ResetClock: ; 6392
 	jp Init
 ; 639b
 
-Function639b: ; unreferenced
+Unreferenced_Function639b:
 	; If bit 0 or 1 of [wTitleScreenTimer] is set, we don't need to be here.
 	ld a, [wTitleScreenTimer]
 	and $3