editorial tweak to the single-length note.

Author: tabatkins

css3-images/Overview.html

@@ -1116,11 +1116,11 @@ <h4 class=no-toc id=radial-gradient-syntax><span class=secno>4.2.1. </span>
 
       <p class=note>Note that percentages are <em>not</em> allowed here; they
        can only be used to specify the size of an elliptical gradient, not a
-       circular one. This restriction exists because there is no obvious
-       answer as to which dimension the percentage should be relative to. A
-       future level of this module may provide the ability to size circles
-       with percentages, perhaps with more explicit controls over which
-       dimension is used.</p>
+       circular one. This restriction exists because there is are multiple
+       reasonable answers as to which dimension the percentage should be
+       relative to. A future level of this module may provide the ability to
+       size circles with percentages, perhaps with more explicit controls
+       over which dimension is used.</p>
     </dl>
 
     <p>If <a href="#ltshape"><i>&lt;shape></i></a> is specified as

css3-images/Overview.src.html

@@ -688,7 +688,7 @@ <h4 class='no-toc' id='radial-gradient-syntax'>
 					<p>Gives the radius of the circle explicitly. Negative values are
 				invalid.</p>
 
-					<p class='note'>Note that percentages are <em>not</em> allowed here; they can only be used to specify the size of an elliptical gradient, not a circular one.  This restriction exists because there is no obvious answer as to which dimension the percentage should be relative to.  A future level of this module may provide the ability to size circles with percentages, perhaps with more explicit controls over which dimension is used.</p>
+					<p class='note'>Note that percentages are <em>not</em> allowed here; they can only be used to specify the size of an elliptical gradient, not a circular one.  This restriction exists because there is are multiple reasonable answers as to which dimension the percentage should be relative to.  A future level of this module may provide the ability to size circles with percentages, perhaps with more explicit controls over which dimension is used.</p>
 				</dd>
 			</dl>