[css-text] Add issue with extra info wrt auto behavior

Author: fantasai

css-text-decor/Overview.html

@@ -942,6 +942,9 @@ <h3 id=text-underline-position-property><span class=secno>2.6. </span> Text
      in such cases, aligning to the em box edge as described for ‘<code
      class=css>under</code>’ is more appropriate.
 
+    <p class=issue>See also
+     http://lists.w3.org/Archives/Public/www-style/2010Dec/0409.html
+
    <dt><dfn id=underline-alphabetic
     title="text-underline-position: alphabetic">‘<code
     class=css>alphabetic</code>’</dfn>

css-text-decor/Overview.src.html

@@ -603,6 +603,7 @@ <h3 id="text-underline-position-property">
       scripts such as Han or Tibetan, for which an alphabetic
       underline is too high: in such cases, aligning to the em box
       edge as described for ''under'' is more appropriate.
+      <p class="issue">See also http://lists.w3.org/Archives/Public/www-style/2010Dec/0409.html
     <dt><dfn id="underline-alphabetic" title="text-underline-position: alphabetic">''alphabetic''</dfn></dt>
     <dd>The underline is positioned relative to the alphabetic baseline. In
       this case the underline is likely to cross some descenders.