[css-color-3] Remove old note for the appearance property

Author: donovanglover

css-color-3/Overview.src.html

@@ -1638,8 +1638,6 @@ <h4 id="css2-system">CSS2 system colors</h4>
 </pre>
 </div>
 
-<p class="note"><strong>Note.</strong> The CSS2 System Color values have been deprecated in favor of the CSS3 UI '<a href="https://www.w3.org/TR/css3-ui/#appearance" class="index-inst">appearance</a>' property. If you want to emulate the look of a user interface related element or control, please use the 'appearance' property instead of attempting to mimic a user interface element through a combination of system colors.</p>
-
 
 <h3 id="notes">Notes on using colors</h3>