Fixes ZF-9750 Corrects a typo in the docblock of Zend_Pdf::__construct()

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@22218 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Pdf.php

@@ -286,7 +286,7 @@ class Zend_Pdf
      * from a file.
 
      * $revision used to roll back document to specified version
-     * (0 - currtent version, 1 - previous version, 2 - ...)
+     * (0 - current version, 1 - previous version, 2 - ...)
      *
      * @param string  $source - PDF file to load
      * @param integer $revision