[css-transitions-2] Spell check (i.e., convert from en-UK to en-US).

Author: dbaron

css-transitions-2/Overview.bs

@@ -533,7 +533,7 @@ as follows:
     <tr>
       <td><em>not</em> idle and <em>not</em> after &rarr; idle</td>
       <td>{{transitioncancel}}</td>
-      <td>The <a>active time</a> of the animation at the moment it was cancelled
+      <td>The <a>active time</a> of the animation at the moment it was canceled
           calculated using a <a>fill mode</a> of both.</td>
     </tr>
   </tbody>