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/chansey.asm

@@ -1,10 +1,10 @@
-; ChanseyPokedexEntry: ; 0x1b942e
 	db "EGG@" ; species name
 	dw 307, 760 ; height, weight
 
 	db   "People try to"
 	next "catch it for its"
 	next "extremely"
+
 	page "nutritious eggs,"
 	next "but it rarely can"
 	next "be found.@"