fix missed line breaks

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

@@ -53,6 +53,7 @@ alert(id); // TypeError: Cannot convert a Symbol value to a string
 That's a "language guard" against messing up, because strings and symbols are fundamentally different and should not accidentally convert one into another.
 
 If we really want to show a symbol, we need to explicitly call `.toString()` on it, like here:
+
 ```js run
 let id = Symbol("id");
 *!*
@@ -61,6 +62,7 @@ alert(id.toString()); // Symbol(id), now it works
 ```
 
 Or get `symbol.description` property to show the description only:
+
 ```js run
 let id = Symbol("id");
 *!*