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/squirtle.asm

@@ -1,10 +1,10 @@
-; SquirtlePokedexEntry: ; 0x181926
 	db "TINYTURTLE@" ; species name
 	dw 108, 200 ; height, weight
 
 	db   "When it feels"
 	next "threatened, it"
 	next "draws its legs"
+
 	page "inside its shell"
 	next "and sprays water"
 	next "from its mouth.@"