Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip

docs/docs.html

@@ -2137,7 +2137,7 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
 <input class="btn" type="button" value="Input">
 <input class="btn" type="submit" value="Submit">
 {% endhighlight %}
-    <p>As a best practice, <strong>we highly recommend matching using the <code>&lt;button&lt;</code> element whenever possible</strong> to ensure matching cross-browser rendering.</p>
+    <p>As a best practice, <strong>we highly recommend matching using the <code>&lt;button&gt;</code> element whenever possible</strong> to ensure matching cross-browser rendering.</p>
 
   </div>
 
@@ -2561,6 +2561,11 @@ For example, <code>&lt;section&gt;</code> should be wrapped as inline.
 </div>
 {% endhighlight %}
 
+    <p class="alert alert-info">
+      <strong>Heads up!</strong>
+      Using icons without any additional content means the icons are not represented to screen reader users.
+    </p>
+
     <h5>Dropdown in a button group</h5>
     <div class="bs-docs-example">
       <div class="btn-group">