[css-text] Fix a link

Author: kojiishi

css-text/Overview.bs

@@ -1674,7 +1674,7 @@ Handling Symbols and Punctuation</h4>
       is generally treated the same as a <i>visually-perceived letter</i>:
       in the case of ''inter-word'', as a Latin <i>visually-perceived letter</i>;
       in the case of ''distribute'', as a Han <i>visually-perceived letter</i>;
-      and in the case of ''text-justify:auto'', as a <i>visually-perceived letter</i> of the dominant script.
+      and in the case of <a value for=text-justify>auto</a>, as a <i>visually-perceived letter</i> of the dominant script.
 
     <p>However, by typographic tradition there may be additional rules 
       controlling the justification of symbols and punctuation.