[ZF-7302]typo from instractions to instructions

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@16827 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Pdf/Page.php

@@ -144,7 +144,7 @@ class Zend_Pdf_Page
     protected $_attached;
 
     /**
-     * Stream of the drawing instractions.
+     * Stream of the drawing instructions.
      *
      * @var string
      */