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/marill.asm

@@ -1,10 +1,10 @@
-; MarillPokedexEntry: ; 0x1cd705
 	db "AQUAMOUSE@" ; species name
 	dw 104, 190 ; height, weight
 
 	db   "The fur on its"
 	next "body naturally"
 	next "repels water. It"
+
 	page "can stay dry, even"
 	next "when it plays in"
 	next "the water.@"