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/ekans.asm

@@ -1,10 +1,10 @@
-; EkansPokedexEntry: ; 0x181fd4
 	db "SNAKE@" ; species name
 	dw 607, 150 ; height, weight
 
 	db   "It flutters the"
 	next "tip of its tongue"
 	next "to seek out the"
+
 	page "scent of prey,"
 	next "then swallows the"
 	next "prey whole.@"