Add text-autospace:punctuation for French punctuation

Author: fantasai

css3-text/Overview.src.html

@@ -2300,6 +2300,13 @@ <h3 id="text-autospace"><span class="secno">7.4.</span>
         <dd>Extends the width of the space character while surrounded by ideographs.</dd>
       <dt><dfn title="text-autospace:ideograph-parenthesis"><code>ideograph-parenthesis</code></dfn></dt>
         <dd>Creates extra spacing between normal (non wide) parenthesis and ideographs.</dd>
+      <dt><dfn title="text-autospace:punctuation"><code>punctuation</code></dfn>
+        <dd>Creates extra non-breaking spacing around punctuation as required by
+          language-specific typographic conventions. For example, if the
+          element's content language is French, narrow no-break space (U+202F)
+          and no-break space (U+00A0) should be inserted where required by
+          <a href="http://unicode.org/udhr/n/notes_fra.html">French typographic
+          guidelines</a>.
     </dl>
     <p class="issue">We are considering to cut ideograph-space and ideograph-parenthesis
       as these two, unlike others, are to fix errors in the document