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/tentacruel.asm

@@ -1,10 +1,10 @@
-; TentacruelPokedexEntry: ; 0x1b8337
 	db "JELLYFISH@" ; species name
 	dw 503, 1210 ; height, weight
 
 	db   "When its 80 feel-"
 	next "ers absorb water,"
 	next "it stretches to"
+
 	page "become like a net"
 	next "to entangle its"
 	next "prey.@"