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/poliwag.asm

@@ -1,10 +1,10 @@
-; PoliwagPokedexEntry: ; 0x182f91
 	db "TADPOLE@" ; species name
 	dw 200, 270 ; height, weight
 
 	db   "The swirl on its"
 	next "belly is its"
 	next "insides showing"
+
 	page "through the skin."
 	next "It looks clearer"
 	next "after it eats.@"