change all anchor alert closes to buttons

docs/components.html

@@ -1684,19 +1684,19 @@
       <h3>Example alerts</h3>
       <p>Wrap your message and an optional close icon in a div with simple class.</p>
       <div class="alert">
-        <a class="close" data-dismiss="alert" href="#">&times;</a>
+        <button class="close" data-dismiss="alert">&times;</button>
         <strong>Warning!</strong> Best check yo self, you're not looking too good.
       </div>
 <pre class="prettyprint linenums">
 &lt;div class="alert"&gt;
-  &lt;a class="close" data-dismiss="alert" href="#"&gt;&times;&lt;/a&gt;
+  &lt;button class="close" data-dismiss="alert"&gt;&times;&lt;/button&gt;
   &lt;strong&gt;Warning!&lt;/strong&gt; Best check yo self, you're not looking too good.
 &lt;/div&gt;
 </pre>
       <p><span class="label label-info">Heads up!</span> iOS devices require an <code>href="#"</code> for the dismissal of alerts. Be sure to include it and the data attribute for fully responsive and dismissable alerts.</p>
       <p>Easily extend the standard alert message with two optional classes: <code>.alert-block</code> for more padding and text controls and <code>.alert-heading</code> for a matching heading.</p>
       <div class="alert alert-block">
-        <a class="close" data-dismiss="alert" href="#">&times;</a>
+        <button class="close" data-dismiss="alert">&times;</button>
         <h4 class="alert-heading">Warning!</h4>
         <p>Best check yo self, you're not looking too good. Nulla vitae elit libero, a pharetra augue. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.</p>
       </div>
@@ -1715,7 +1715,7 @@
     <div class="span4">
       <h3>Error or danger</h3>
       <div class="alert alert-error">
-        <a class="close" data-dismiss="alert" href="#">&times;</a>
+        <button class="close" data-dismiss="alert">&times;</button>
         <strong>Oh snap!</strong> Change a few things up and try submitting again.
       </div>
 <pre class="prettyprint linenums">
@@ -1727,7 +1727,7 @@
     <div class="span4">
       <h3>Success</h3>
       <div class="alert alert-success">
-        <a class="close" data-dismiss="alert" href="#">&times;</a>
+        <button class="close" data-dismiss="alert">&times;</button>
         <strong>Well done!</strong> You successfully read this important alert message.
       </div>
 <pre class="prettyprint linenums">
@@ -1739,7 +1739,7 @@
     <div class="span4">
       <h3>Information</h3>
       <div class="alert alert-info">
-        <a class="close" data-dismiss="alert" href="#">&times;</a>
+        <button class="close" data-dismiss="alert">&times;</button>
         <strong>Heads up!</strong> This alert needs your attention, but it's not super important.
       </div>
 <pre class="prettyprint linenums">