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/mantine.asm

@@ -1,10 +1,10 @@
-; MantinePokedexEntry: ; 0x1d0e25
 	db "KITE@" ; species name
 	dw 611, 4850 ; height, weight
 
 	db   "It swims along"
 	next "freely, eating"
 	next "things that swim"
+
 	page "into its mouth."
 	next "Its whole body is"
 	next "very coarse.@"