Rename map scene vars and partially document Oak's lab

data/maps/Route24/map.json

@@ -136,7 +136,7 @@
       "x": 10,
       "y": 15,
       "elevation": 3,
-      "var": "VAR_0x406B",
+      "var": "VAR_MAP_SCENE_ROUTE24",
       "var_value": 0,
       "script": "Route24_EventScript_168660"
     },
@@ -145,7 +145,7 @@
       "x": 11,
       "y": 15,
       "elevation": 3,
-      "var": "VAR_0x406B",
+      "var": "VAR_MAP_SCENE_ROUTE24",
       "var_value": 0,
       "script": "Route24_EventScript_16866C"
     }

data/maps/Route24/scripts.inc

@@ -4,7 +4,7 @@ Route24_MapScripts:: @ 816861F
 Route24_EventScript_168620:: @ 8168620
 	lock
 	faceplayer
-	compare_var_to_value VAR_0x406B, 1
+	compare_var_to_value VAR_MAP_SCENE_ROUTE24, 1
 	goto_if_eq EventScript_168656
 	msgbox gUnknown_8188C3C
 	checkitemspace ITEM_NUGGET, 1
@@ -62,7 +62,7 @@ EventScript_1686B9:: @ 81686B9
 	setvar VAR_LAST_TALKED, 1
 	trainerbattle 3, TRAINER_TEAM_ROCKET_GRUNT_6, 0, Text_188DDC
 	msgbox gUnknown_8188DF1
-	setvar VAR_0x406B, 1
+	setvar VAR_MAP_SCENE_ROUTE24, 1
 	return
 
 EventScript_1686FD:: @ 81686FD