Editorial revisions to intro

content/practices/high-contrast/high-contrast-practice.html

@@ -49,7 +49,12 @@ <h1>Supporting High Contrast Settings</h1>
       <section id="introduction">
         <h2>Introduction</h2>
         <p>
-          People with <a href="https://www.w3.org/WAI/people-use-web/abilities-barriers">visual impairments using the web</a> often need to increase the contrast of content to make it perceivable to them.  Operating systems provide settings for users to increase contrast or choose color themes that are useful to them.  Authors must ensure content adapts to user settings and this section explains how to components can adapt to those settings and verify compatibility through testing.
+          Some people with
+          <a href="https://www.w3.org/WAI/people-use-web/abilities-barriers/visual/">visual disabilities using the web</a>
+          need more than the required default minimum color contrast to perceive content.
+          Operating systems provide settings that enable those users to increase contrast and choose alternate color themes.
+          Web authors can ensure their content is accessible to those users by appropriately responding to such operating system settings.
+          This section explains how to make components responsive to color and contrast settings and how to test support for those settings.
         </p>
 
         <p>This section covers:</p>