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/mareep.asm

@@ -1,10 +1,10 @@
-; MareepPokedexEntry: ; 0x1cd551
 	db "WOOL@" ; species name
 	dw 200, 170 ; height, weight
 
 	db   "It stores lots of"
 	next "air in its soft"
 	next "fur, allowing it"
+
 	page "to stay cool in"
 	next "summer and warm"
 	next "in winter.@"