Update docs/components.html

Fixed a typo in in the "Components -> Alerts -> Dismiss Buttons" section. The HTML example using <a href="#"...> closes with a tag instead of a tag.

docs/components.html

@@ -1941,7 +1941,7 @@
 
           <h3>Dismiss buttons</h3>
           <p>Mobile Safari and Mobile Opera browsers, in addition to the <code>data-dismiss="alert"</code> attribute, require an <code>href="#"</code> for the dismissal of alerts when using an <code>&lt;a&gt;</code> tag.</p>
-          <pre class="prettyprint linenums">&lt;a href="#" class="close" data-dismiss="alert"&gt;&times;&lt;/button&gt;</pre>
+          <pre class="prettyprint linenums">&lt;a href="#" class="close" data-dismiss="alert"&gt;&times;&lt;/a&gt;</pre>
           <p>Alternatively, you may use a <code>&lt;button&gt;</code> element with the data attribute, which we have opted to do for our docs. When using <code>&lt;button&gt;</code>, you must include <code>type="button"</code> or your forms may not submit.</p>
           <pre class="prettyprint linenums">&lt;button type="button" class="close" data-dismiss="alert"&gt;&times;&lt;/button&gt;</pre>