Adding clarification about strokes not being part of the shapes

considered from SVG.

Author: ratan@microsoft.com

css3-exclusions/Exclusions.src.html

@@ -1211,8 +1211,8 @@ <h3 id="shapes-from-svg-syntax">Shapes from SVG Syntax</h3>
           The definitions use <code><a href="http://www.w3.org/TR/css3-values/#lengths">&lt;length&gt;</a></code> type and the <code><a href="">&lt;percentage&gt;</a></code> types (see [[!CSS3VAL]]).
           Percentages are resolved from the border box of the element to which the property applies. For the radius 
           <code>r</code> of the <code>circle</code> shape, a percentage value is resolved as
-          <a href="http://www.w3.org/TR/SVG/coords.html#Units">specified</a> in the SVG recommendation (see [[!SVG11]])</p>
-          
+          <a href="http://www.w3.org/TR/SVG/coords.html#Units">specified</a> in the SVG recommendation (see [[!SVG11]]).
+		  SVG strokes are not considered part of the shape, thus only the following geometries are valid.
       </p>