re-apply overwritten commit from @bungeman

Author: svgeesus

css-fonts-3/Fonts.html

@@ -5036,7 +5036,7 @@ <h3 id=feature-precedence><span class=secno>7.2. </span>Feature precedence</h3>
     title="font-feature-settings!!property">‘<code
     class=property>font-feature-settings</code>’</a>. For example, setting
     a non-default value for the ‘<code
-    class=property>letter-spacing</code>’ property disables common
+    class=property>letter-spacing</code>’ property disables optional
     ligatures.
 
    <li>Font features implied by the value of <a