fix grammar in "Underlined text" example

docs/_includes/css/type.html

@@ -146,10 +146,10 @@ You can use the mark tag to <mark>highlight</mark> text.
   <h3>Underlined text</h3>
   <p>To underline text use the <code>&lt;u&gt;</code> tag.</p>
   <div class="bs-example">
-    <p><u>This line of text is will render as underlined</u></p>
+    <p><u>This line of text will render as underlined</u></p>
   </div>
 {% highlight html %}
-<u>This line of text is will render as underlined</u>
+<u>This line of text will render as underlined</u>
 {% endhighlight %}
 
   <p>Make use of HTML's default emphasis tags with lightweight styles.</p>