Clarify the importance of PC/SC Lite not including this

Author: zgroza

index.html

@@ -177,8 +177,8 @@ <h2><dfn>SmartCardContext</dfn> interface</h2>
       <aside class="note" title="Lack of reader groups support">
         <p>This API does not include an equivalent for the "reader groups"
           concept found in [[PCSC5]]. The primary reason for this omission is
-          that PC/SC Lite implementation does not support the related methods,
-          making consistent cross-platform behavior unachievable.</p>
+          that PC/SC Lite does not support it&mdash;and thus, it's unavailable
+          on most platforms.</p>
       </aside>
       <section>
         <h3><dfn>listReaders()</dfn> method</h3>