Merge pull request #2191 from vsemozhetbyt/patch-2

Clarify a bit ambiguous wording in 1.5.7

Author: iliakan

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

@@ -42,7 +42,7 @@ alert( map.size ); // 3
 As we can see, unlike objects, keys are not converted to strings. Any type of key is possible.
 
 ```smart header="`map[key]` isn't the right way to use a `Map`"
-Although `map[key]` also works, e.g. we can set `map[key] = 2`, this is treating `map` as a plain JavaScript object, so it implies all corresponding limitations (no object keys and so on).
+Although `map[key]` also works, e.g. we can set `map[key] = 2`, this is treating `map` as a plain JavaScript object, so it implies all corresponding limitations (only string/symbol keys and so on).
 
 So we should use `map` methods: `set`, `get` and so on.
 ```