fix #8701: IE 10+ supports <fieldset disabled>

*golf clap*

css.html

@@ -1466,7 +1466,7 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
 
     <div class="bs-callout bs-callout-danger">
       <h4>Cross-browser compatibility</h4>
-      <p>While Bootstrap will apply these styles in all browsers, Internet Explorer doesn't actually support the <code>disabled</code> attribute on a <code>&lt;fieldset&gt;</code>. Use custom JavaScript to disable the fieldset in that case.</p>
+      <p>While Bootstrap will apply these styles in all browsers, Internet Explorer 9 and below don't actually support the <code>disabled</code> attribute on a <code>&lt;fieldset&gt;</code>. Use custom JavaScript to disable the fieldset in these browsers.</p>
     </div>
 
     <form class="bs-example form-inline">