Move context-specific callout to general tag usage

docs/_includes/css/buttons.html

@@ -154,11 +154,6 @@
     <h4>Link functionality caveat</h4>
     <p>This class uses <code>pointer-events: none</code> to try to disable the link functionality of <code>&lt;a&gt;</code>s, but that CSS property is not yet standardized and isn't fully supported in Opera 18 and below, or in Internet Explorer 11. In addition, even in browsers that do support <code>pointer-events: none</code>, keyboard navigation remains unaffected, meaning that sighted keyboard users and users of assistive technologies will still be able to activate these links. So to be safe, use custom JavaScript to disable such links.</p>
   </div>
-  <div class="bs-callout bs-callout-warning" id="callout-buttons-context-usage">
-    <h4>Context-specific usage</h4>
-    <p>While button classes can be used on <code>&lt;a&gt;</code> and <code>&lt;button&gt;</code> elements, only <code>&lt;button&gt;</code> elements are supported within our nav and navbar components.</p>
-  </div>
-
 
   <h2 id="buttons-tags">Button tags</h2>
   <p>Use the button classes on an <code>&lt;a&gt;</code>, <code>&lt;button&gt;</code>, or <code>&lt;input&gt;</code> element.</p>
@@ -175,6 +170,11 @@
 <input class="btn btn-default" type="submit" value="Submit">
 {% endhighlight %}
 
+  <div class="bs-callout bs-callout-warning" id="callout-buttons-context-usage">
+    <h4>Context-specific usage</h4>
+    <p>While button classes can be used on <code>&lt;a&gt;</code> and <code>&lt;button&gt;</code> elements, only <code>&lt;button&gt;</code> elements are supported within our nav and navbar components.</p>
+  </div>
+
   <div class="bs-callout bs-callout-warning" id="callout-buttons-anchor-accessibility">
     <h4>Links acting as buttons</h4>
     <p>If the <code>&lt;a&gt;</code> elements are used to act as buttons – triggering in-page functionality, rather than navigating to another document or section within the current page – they should also be given an appropriate <code>role="button"</code>.</p>