Fixed euphonic error.

Changed "an" to "a". 

P.S: Love your work! Can't believe that its free!

Author: Shashank Rajesh

1-js/06-advanced-functions/10-bind/article.md

@@ -43,7 +43,7 @@ The task is quite typical -- we want to pass an object method somewhere else (he
 
 ## Solution 1: a wrapper
 
-The simplest solution is to use an wrapping function:
+The simplest solution is to use a wrapping function:
 
 ```js run
 let user = {