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/butterfree.asm

@@ -1,10 +1,10 @@
-; ButterfreePokedexEntry: ; 0x181b45
 	db "BUTTERFLY@" ; species name
 	dw 307, 710 ; height, weight
 
 	db   "It flits from"
 	next "flower to flower,"
 	next "collecting honey."
+
 	page "It can even"
 	next "identify distant"
 	next "flowers in bloom.@"