[BUGFIX] Typo "boostrap" to "bootstrap"

Author: lolli42

Resources/Private/Templates/Styleguide/Helpers.html

@@ -3,7 +3,7 @@
 <f:section name="content">
 	<h1><f:translate key="helpers" /></h1>
 
-	<h2>Boostrap</h2>
+	<h2>Bootstrap</h2>
 	<p>Since Sept 2014 <a href="http://getbootstrap.com/" target="_blank">Bootstrap</a> is included in TYPO3 CMS backend.</p>
 
 	<h2>Normalize</h2>