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/magneton.asm

@@ -1,10 +1,10 @@
-; MagnetonPokedexEntry: ; 0x1b870a
 	db "MAGNET@" ; species name
 	dw 303, 1320 ; height, weight
 
 	db   "When many"
 	next "MAGNETON gather"
 	next "together, the"
+
 	page "resulting magnetic"
 	next "storm disrupts"
 	next "radio waves.@"