Update tx-weights-fees.md (#2120)

Co-authored-by: Kian Paimani <[email protected]>

content/md/en/docs/build/tx-weights-fees.md

@@ -237,12 +237,12 @@ use frame_support:: {
         Pays::Yes,
     },
    weights::Weight,
+};
 
 #[pallet::weight(FunctionOf(
   |args: (&Vec<User>,)| args.0.len().saturating_mul(10_000),
   )
 ]
-
 fn handle_users(origin, calls: Vec<User>) {
     // Do something per user
 }