Editorial changes to yubikey-u2f.rst (#785)

Signed-off-by: DougTW <doug.martin@intel.com>

source/tutorials/yubikey-u2f.rst

@@ -1,44 +1,40 @@
 .. _yubikey-u2f:
 
-YubiKey\* Support 
+YubiKey\* Support
 #################
 
-YubiKey\* is a USB security token manufactured by `Yubico`_. Depending on the
-model, a YubiKey can support different authentication protocols including:
-One-Time Password (OTP), Smart card, FIDO2, and Universal 2nd Factor (U2F).
-
-These instructions will go over configuring a YubiKey for U2F authentication
-through a web browser on a |CL-ATTR| system. 
-
-A list of `websites
-accepting U2F authentication with the YubiKey`_ is available on the Yubico
-website. See the Yubico website to learn more about the Yubikey:
-https://www.yubico.com/getstarted/meet-the-yubikey/ 
-
-
+This tutorial explains how to configure a YubiKey\* for U2F authentication
+through a web browser on a |CL-ATTR| system.
 
 .. contents:: :local:
    :depth: 1
 
+Description
+***********
 
+YubiKey is a USB security token manufactured by `Yubico`_. Depending on the
+model, a YubiKey can support different authentication protocols including
+One-Time Password (OTP), Smart card, FIDO2, and Universal 2nd Factor (U2F).
 
-Prerequisites 
+A list of `websites that accept U2F authentication with the YubiKey`_
+is available on the Yubico website. See the Yubico website to learn more about
+the Yubikey: https://www.yubico.com/getstarted/meet-the-yubikey/
+
+Prerequisites
 *************
 
-This tutorial assumes you have: 
+This tutorial assumes you have:
 
 #. |CL| installed and running.
 
-#. Mozilla Firefox installed on |CL|. 
+#. Mozilla Firefox installed on |CL|.
 
 #. A YubiKey.
 
-
-
-Enable Linux udev rules for YubiKey 
+Enable Linux udev rules for YubiKey
 ***********************************
 
-:command:`udev` is the Linux device manager which handles events when USB
+:command:`udev` is the Linux device manager that handles events when USB
 devices are added and removed. Custom rules needs to be created to properly
 identify the YubiKey and provide applications access.
 
@@ -47,45 +43,45 @@ YubiKey with Linux
 <https://support.yubico.com/support/solutions/articles/15000006449>`_
 
 
-#. Create the udev rules folder under :file:`/etc`
-   
+#. Create the udev rules folder under :file:`/etc`.
+
    .. code:: bash
-      
+
       sudo mkdir -p /etc/udev/rules.d/
 
 
 #. Download the u2f rules from the Yubico GitHub:
 
    .. code:: bash
-      
+
       curl -O https://raw.githubusercontent.com/Yubico/libu2f-host/master/70-u2f.rules
 
-      
+
 #. Move the downloaded :file:`70-u2f.rules` file into the :file:`/etc/udev`
-   folder
+   folder.
 
    .. code:: bash
-      
+
       sudo mv 70-u2f.rules /etc/udev/rules.d/
 
 
 #. The udev rules should automatically be reloaded. However, they can be
-   manually reloaded or reboot the system:
+   manually reloaded or you can reboot the system.
 
    .. code:: bash
-      
+
       sudo udevadm control --reload-rules && sudo udevadm trigger
 
 
-#. Plugin and validate the YubiKey appears as a USB device:
+#. Plugin and validate the YubiKey appears as a USB device.
 
    .. code:: bash
-      
+
       lsusb
 
 
 
-Enable U2F in Mozilla Firefox 
+Enable U2F in Mozilla Firefox
 *****************************
 
 Firefox comes with U2F web authentication support disabled by default. U2F
@@ -102,12 +98,12 @@ support in Mozilla Firefox
    settings.
 
    .. code:: bash
-      
+
       about:config
 
 #. Click the *I accept the risk!* button to continue to the advanced settings
 
-#. Search for the :command:`security.webauth.u2f` and double-click it 
+#. Search for the :command:`security.webauth.u2f` and double-click it
    so *Value* becomes **true**.
 
 
@@ -115,7 +111,7 @@ Your YubiKey is now usable on |CL| with Mozilla Firefox with websites that
 support U2F authentication.
 
 
-Related topics 
+Related topics
 **************
 
 - |CL| :ref:`security`
@@ -123,4 +119,5 @@ Related topics
 
 .. _`Yubico`: https://www.yubico.com/
 
-.. _`websites accepting U2F authentication with the YubiKey`: https://www.yubico.com/works-with-yubikey/catalog/#protocol=universal-2nd-factor-(u2f)&usecase=all&key=all
+.. _`websites that accept U2F authentication with the YubiKey`:
+.. https://www.yubico.com/works-with-yubikey/catalog/#protocol=universal-2nd-factor-(u2f)&usecase=all&key=all