Document Three Island scripts

data/maps/ThreeIsland_Harbor/map.json

@@ -38,7 +38,7 @@
       "movement_range_y": 1,
       "trainer_type": 0,
       "trainer_sight_or_berry_tree_id": 0,
-      "script": "ThreeIsland_Harbor_EventScript_171EAA",
+      "script": "ThreeIsland_Harbor_EventScript_Sailor",
       "flag": "0"
     }
   ],

data/maps/ThreeIsland_Harbor/scripts.inc

@@ -1,7 +1,7 @@
 ThreeIsland_Harbor_MapScripts:: @ 8171EA9
 	.byte 0
 
-ThreeIsland_Harbor_EventScript_171EAA:: @ 8171EAA
+ThreeIsland_Harbor_EventScript_Sailor:: @ 8171EAA
 	lock
 	faceplayer
 	message Text_WhereDoYouWantToSail