Fix minor spelling error in API docs

docs/index.html

@@ -640,7 +640,7 @@ var peer = new Peer({
         <div class="child " id="mediaconnection-answer"><span class="name"><a
               href="#mediaconnection-answer">.answer</a><span class="tag type method">method</span><span
               class="snippet">mediaConnection.answer([stream],[options]);</span></span>
-          <p class="description">When recieving a <a href='#peeron-call'><code>call</code></a> event on a peer, you can
+          <p class="description">When receiving a <a href='#peeron-call'><code>call</code></a> event on a peer, you can
             call <code>.answer</code> on the media connection provided by the callback to accept the call and optionally
             send your own media stream.</p>
           <div class="children">
@@ -754,4 +754,4 @@ var peer = new Peer({
     </div>
   </section>
 
-</body>
+</body>