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/pidgeot.asm

@@ -1,10 +1,10 @@
-; PidgeotPokedexEntry: ; 0x181dd7
 	db "BIRD@" ; species name
 	dw 411, 870 ; height, weight
 
 	db   "Its outstanding"
 	next "vision allows it"
 	next "to spot splashing"
+
 	page "MAGIKARP, even"
 	next "while flying at"
 	next "3300 feet.@"