Typo error in DocBlock fixed

Author: vovayatsyuk

Diff for: lib/web/mage/sticky.js

@@ -12,7 +12,7 @@ define([
     $.widget('mage.sticky', {
         options: {
             /**
-             * Element selector, who's height that will be used to restrict the
+             * Element selector, who's height will be used to restrict the
              * maximum offsetTop position of the stuck element.
              * Default uses document body.
              * @type {String}