Merge pull request #662 from carmacleod/issue659

Typo in layout grid description #659

aria-practices.html

@@ -1397,7 +1397,7 @@ <h5>Keyboard Interaction For Layout Grids</h5>
           </ul>
           <ul class="note">
             <li>
-              When the above grid navigation keys move focus, whether the focus is sett on an element inside the cell or the grid cell depends on cell content.
+              When the above grid navigation keys move focus, whether the focus is set on an element inside the cell or the grid cell depends on cell content.
               See <a href="#gridNav_focus">Whether to Focus on a Cell or an Element Inside It</a>.
             </li>
             <li>