Clean up comments

Base data: types uniquely lacked a comment; items on one line; distinguish unknowns
Dex entries: don't imply that pointers don't exist

data/pokemon/dex_entries/articuno.asm

@@ -1,10 +1,10 @@
-; ArticunoPokedexEntry: ; 0x1cc632
 	db "FREEZE@" ; species name
 	dw 507, 1220 ; height, weight
 
 	db   "Legendary bird"
 	next "#MON. As it"
 	next "flies through the"
+
 	page "sky, it cools the"
 	next "air, causing snow"
 	next "to fall.@"