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/onix.asm

@@ -1,10 +1,10 @@
-; OnixPokedexEntry: ; 0x1b8c98
 	db "ROCK SNAKE@" ; species name
 	dw 2810, 4630 ; height, weight
 
 	db   "As it digs through"
 	next "the ground, it"
 	next "absorbs many hard"
+
 	page "objects. This is"
 	next "what makes its"
 	next "body so solid.@"