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/arcanine.asm

@@ -1,10 +1,10 @@
-; ArcaninePokedexEntry: ; 0x182f1c
 	db "LEGENDARY@" ; species name
 	dw 603, 3420 ; height, weight
 
 	db   "An ancient picture"
 	next "scroll shows that"
 	next "people were"
+
 	page "attracted to its"
 	next "movement as it ran"
 	next "through prairies.@"