Fix typo in USB API documentation.

chrome/common/extensions/docs/static/app_hardware.html

 <div id="pageData-name" class="pageData">Accessing Hardware Devices</div>
 <div id="pageData-showTOC" class="pageData">true</div>
 
 <p>
 This doc shows you how packaged apps can connect to USB devices
 and read from and write to a user's serial ports.
 See also the reference docs for the
 <a href="experimental.usb.html">USB API</a>
 and the
 <a href="experimental.serial.html">Serial API</a>.
@@ skipping 64 matching lines @@
   </tr>
   <tr>
     <td>eventCallbacks(object)</td>
     <td>An object with a single key, "onEvent",
       to be called whenever an event occurs on the corresponding device.
       This will be the primary method of receiving information from the device.
       As the host-initiated USB protocol is complex, read on to learn more.
     </td>
   </tr>
   <tr>
-    <td>onDevideFoundCallback()</td>
+    <td>onDeviceFoundCallback()</td>
     <td>Called when the device is found.
       The callback's parameter is an object
       with three properties: <code>handle</code>,
       <code>vendorId</code>,
       <code>productId</code>;
       or <code>NULL</code>,
       if no device is found.
       Save this object
       as it's required to send messages to the device.</td>
   </tr>
@@ skipping 591 matching lines @@
 You can flush your serial device buffer by issuing the flush command on the API:
 </p>
 
 <pre>
 var flushSerial=function(str) {
   chrome.experimental.serial.flush(connectionInfo.connectionId, onFlush);
 }
 </pre>
 
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