Update index.html (#2779)

favour -> favor

files/en-us/web/guide/events/index.html

@@ -33,7 +33,7 @@
 	<li>both <a href="/en-US/docs/Web/Guide/API/DOM/Events/Touch_events">touch events</a> and the earlier <a href="/en-US/docs/Web/Guide/API/DOM/Events/Touch_events_(Mozilla_experimental)">mozilla experimental touch events</a>, now deprecated.</li>
 </ul>
 
-<p>The <strong>modification of the web page</strong> in structure or content might trigger some events, as explained in the <a href="/en-US/docs/Web/Guide/API/DOM/Events/Mutation_events">mutation events page</a>, but the use of these events has been deprecated in favour of the lighter <a href="/en-US/docs/Web/API/MutationObserver">Mutation Observer</a> approach.</p>
+<p>The <strong>modification of the web page</strong> in structure or content might trigger some events, as explained in the <a href="/en-US/docs/Web/Guide/API/DOM/Events/Mutation_events">mutation events page</a>, but the use of these events has been deprecated in favor of the lighter <a href="/en-US/docs/Web/API/MutationObserver">Mutation Observer</a> approach.</p>
 
 <p>The <strong>media streams</strong> embedded in the HTML documents might trigger some events, as explained in the <a href="/en-US/docs/Web/Guide/API/DOM/Events/Media_events">media events</a> page.</p>