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/steelix.asm

@@ -1,10 +1,10 @@
-; SteelixPokedexEntry: ; 0x1d067c
 	db "IRON SNAKE@" ; species name
 	dw 3002, 8820 ; height, weight
 
 	db   "The many small"
 	next "metal particles"
 	next "that cover this"
+
 	page "#MON's body"
 	next "reflect bright"
 	next "light well.@"