minor fixes

Author: iliakan

1-js/04-object-basics/08-symbol/article.md

@@ -6,7 +6,7 @@ By specification, only two primitive types may serve as object property keys:
 - string type, or
 - symbol type.
 
-Otherwise, if one uses another type, such as number, it's autoconverted to string. So that `obj[1]` is the same as `obj["1"]` and `obj[true]` is the same as `obj["true"]`.
+Otherwise, if one uses another type, such as number, it's autoconverted to string. So that `obj[1]` is the same as `obj["1"]`, and `obj[true]` is the same as `obj["true"]`.
 
 Till now we've been using only strings.