[css-color-5][editorial] Modernize reference to HTML

Author: svgeesus

css-color-5/Overview.bs

@@ -3015,7 +3015,7 @@ unless trailing zeroes have been omitted.
 	Default Style Rules
 </h2>
 
-		The following stylesheet is informative, not normative.  This style sheet could be used by an implementation as part of its default styling of HTML4, HTML5, XHTML1, XHTML1.1, XHTML Basic, and other XHTML Family documents.
+		The following stylesheet is informative, not normative.  This style sheet could be used by an implementation as part of its default styling of HTML Family documents.
 
 		<pre class="lang-css">
 		/* traditional desktop user agent colors for hyperlinks */