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/koffing.asm

@@ -1,10 +1,10 @@
-; KoffingPokedexEntry: ; 0x1b9276
 	db "POISON GAS@" ; species name
 	dw 200, 20 ; height, weight
 
 	db   "If one gets close"
 	next "enough to it when"
 	next "it expels poison-"
+
 	page "ous gas, the gas"
 	next "swirling inside it"
 	next "can be seen.@"