samples: webusb: Update README

Update webusb README with recent changes after index.html was moved to
sample from the external repository.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

samples/subsys/usb/webusb/README.rst

@@ -13,7 +13,7 @@ Sample Overview
 ***************
 
 This simple echo application demonstrates the WebUSB sample application.
-This application receives the data and echoed back to the WebUSB
+This application receives the data and echoes back to the WebUSB
 based web application (web page) running in the browser at host.
 This application is intended for testing purposes only. For running
 real usecase, implement applications based on the WebUSB API.
@@ -37,15 +37,15 @@ Build and flash webusb sample with:
    :goals: flash
    :compact:
 
-Testing with latest Google Chrome on host
-*****************************************
+Testing with the latest Google Chrome on host
+*********************************************
 
-This sample application requires latest Google Chrome, a web page
+This sample application requires the latest Google Chrome, a web page
 based on WebUSB API to connect to the USB device and optionally
 http server running on localhost to serve the web page.
 
 WebUSB is a powerful new feature added to the Web and it is available
-only to secure origins. This means the web page/site that used to
+only to secure origins. This means the web page/site that is used to
 connect to the device must be served over a secure connection (HTTPS).
 
 Follow these steps to run the demo on your host system:
@@ -55,22 +55,25 @@ Follow these steps to run the demo on your host system:
 #. Implement a web app (web page) using WebUSB API and run
    it on localhost.
 
-   See the sample at https://github.com/finikorg/webusb-sample
+   The sample can be found in the webusb sample directory:
+   :zephyr_file:`samples/subsys/usb/webusb/index.html`.
 
-   This sample web page demonstrate how to create and use a WebUSB
+   This sample web page demonstrates how to create and use a WebUSB
    interface, as well as demonstrate the communication between browser
    and WebUSB enabled device.
 
-   see :doc:`demo`
+   There are two ways to access this sample page:
 
-   #. To access JS app go to https://finikorg.github.io/webusb-sample/
+   * Using Chrome browser go to :doc:`demo`
 
-   #. To host the demo page locally: Clone the repo and start a web server
-      in the appropriate directory.
+   * Host the demo page locally: Start a web server
+     in the webusb sample directory.
 
-      .. code-block:: console
+     .. code-block:: console
 
-         $ python -m http.server
+        $ python -m http.server
+
+     Using Chrome browser open url http://localhost:8001/
 
 #. Connect the board to your host.
 
@@ -80,7 +83,8 @@ Follow these steps to run the demo on your host system:
    Note that at the moment WebUSB landing page notification is disabled
    in Chrome on Windows. See https://github.com/WICG/webusb#implementation-status
 
-#. Click on Connect button to connect to the device.
+#. Click on the :guilabel:`Connect` button to connect to the device.
 
-#. Send some text to the device by clicking on the Send button. The demo app
-   will receive the same text from the device and display it in the textarea.
+#. Send some text to the device by clicking on the :guilabel:`Send` button.
+   The demo app will receive the same text from the device and display it in
+   the text area.