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/sentret.asm

@@ -1,10 +1,10 @@
-; SentretPokedexEntry: ; 0x1ccd6b
 	db "SCOUT@" ; species name
 	dw 207, 130 ; height, weight
 
 	db   "When acting as a"
 	next "lookout, it warns"
 	next "others of danger"
+
 	page "by screeching and"
 	next "hitting the ground"
 	next "with its tail.@"