Fix typo (brewity to brevity) (#980)

Fix typo (brewity to brevity)

Author: lex111

1-js/06-advanced-functions/03-closure/article.md

@@ -309,7 +309,7 @@ alert( counter2() ); // 0 (independent)
 ```
 
 
-Hopefully, the situation with outer variables is clear now. For most situations such understanding is enough. There are few details in the specification that we omitted for brewity. So in the next section we cover even more details, not to miss anything.
+Hopefully, the situation with outer variables is clear now. For most situations such understanding is enough. There are few details in the specification that we omitted for brevity. So in the next section we cover even more details, not to miss anything.
 
 ## Environments in detail