minor fixes

Author: iliakan

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

@@ -44,6 +44,8 @@ alert(id1 == id2); // false
 
 If you are familiar with Ruby or another language that also has some sort of "symbols" -- please don't be misguided. JavaScript symbols are different.
 
+To summarize, symbols are "special unique values" with optional description. Let's see where we can use them.
+
 ````warn header="Symbols don't auto-convert to a string"
 Most values in JavaScript support implicit conversion to a string. For instance, we can `alert` almost any value, and it will work. Symbols are special. They don't auto-convert.
 
@@ -80,6 +82,7 @@ alert(id.description); // id
 
 ## "Hidden" properties
 
+
 Symbols allow us to create "hidden" properties of an object, that no other part of code can accidentally access or overwrite.
 
 For instance, if we're working with `user` objects, that belong to a third-party code. We'd like to add identifiers to them.