Update index.html

getInputDevices is depricated.
Replaced with listVideoInputDevices

docs/examples/multi-camera/index.html

@@ -69,7 +69,7 @@ <h1 class="title">Scan 1D/2D Code from Video Camera</h1>
       let selectedDeviceId;
       const codeReader = new ZXing.BrowserMultiFormatReader()
       console.log('ZXing code reader initialized')
-      codeReader.getVideoInputDevices()
+      codeReader.listVideoInputDevices()
         .then((videoInputDevices) => {
           const sourceSelect = document.getElementById('sourceSelect')
           selectedDeviceId = videoInputDevices[0].deviceId