add a comma

Author: fantasai

css3-images/Overview.html

@@ -883,7 +883,7 @@ <h4 class=no-toc id=radial-gradient-syntax><span class=secno>5.2.1. </span>
     href="#ltshapegt"><i>&lt;shape&gt;</i></a> is omitted, the <a
     href="#ending-shape"><i>ending shape</i></a> defaults to a circle if the
     <a href="#ltextentgt"><i>&lt;extent&gt;</i></a> is a single
-    &lt;length&gt; and to an ellipse otherwise.
+    &lt;length&gt;, and to an ellipse otherwise.
 
    <dt id=radial-position><dfn id=ltpositiongt>&lt;position&gt;</dfn>
 

css3-images/Overview.src.html

@@ -562,7 +562,7 @@ <h4 class='no-toc' id='radial-gradient-syntax'>
 		<dd>Can be either ''circle'' or ''ellipse''; determines whether the
 		gradient's <i>ending shape</i> is a circle or an ellipse, respectively.
 		If <i>&lt;shape&gt;</i> is omitted, the <i>ending shape</i> defaults
-		to a circle if the <i>&lt;extent&gt;</i> is a single &lt;length&gt;
+		to a circle if the <i>&lt;extent&gt;</i> is a single &lt;length&gt;,
 		and to an ellipse otherwise.
 
 		<dt id='radial-position'><dfn>&lt;position&gt;</dfn></dt>