edited high contrast description

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

@@ -399,7 +399,7 @@ <h2>Color Scheme (Light or Dark)</h2>
         </p>
         <p>
           To support dark mode, develop styles for dark text on a light background and light text on a dark background and use a media query to apply the appropriate style.
-          The CSS media query <code>prefers-color-scheme</code> identifies the current color scheme by returning <code>light</code> or <code>dark</code>.  Browsers support the <code>prefers-color-scheme</code> media query using the <code>light-dark</code> function to identify a color value for a CSS property.
+          The CSS media query <code>prefers-color-scheme</code> identifies the current color scheme by returning <code>light</code> or <code>dark</code>.  Browsers support the <code>prefers-color-scheme</code> media query using the <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark"><code>light-dark</code> function</a> to identify a color value for a CSS property.
         </p>
         <p>
           Ensure the text content and components of both color schemes meet or exceed the color contrast ratios specified by