fix type error in example of boutique inventory exercise

exercism · Oct 4, 2023 · de61709 · de61709
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commit de61709
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diff --git a/exercises/concept/boutique-inventory/.docs/instructions.md b/exercises/concept/boutique-inventory/.docs/instructions.md
@@ -84,7 +84,6 @@ Implement the `total_stock` function which calculates the total amount of items
 ]
 |> iterator.from_list
 |> total_stock
-|> iterator.to_list
 
 // -> 19
 ```