[css3-fonts] tweak wording a tiny bit

Author: John Daggett

css-fonts/Fonts.html

@@ -4421,7 +4421,7 @@ <h3 id=font-variant-numeric-prop><span class=secno>6.7 </span>Numerical
     remain unchanged. Depending upon the typographic traditions used in a
     given language, ordinal forms may differ from superscript forms. In
     Italian, for example, ordinal forms sometimes include an underline in the
-    design of ordinals.</p>
+    ordinal design.</p>
   </div>
 
   <div class=example id=steak-marinade>