fix

1-js/05-data-types/07-map-set-weakmap-weakset/article.md

@@ -189,7 +189,7 @@ A `Set` is a collection of values, where each value may occur only once.
 
 Its main methods are:
 
-- `new Set(iterable)` -- creates the set, optionally from an array of values (any iterable will do).
+- `new Set(iterable)` -- creates the set, and if an `iterable` object is provided (usually an array), copies values from it into the set.
 - `set.add(value)` -- adds a value, returns the set itself.
 - `set.delete(value)` -- removes the value, returns `true` if `value` existed at the moment of the call, otherwise `false`.
 - `set.has(value)` -- returns `true` if the value exists in the set, otherwise `false`.