Fixing bad path for class PdoSessionHandler

Missing `Handler` directory

Author: Clorr

session/database.rst

@@ -358,7 +358,7 @@ Preparing the Database to Store Sessions
 
 Before storing sessions in the database, you must create the table that stores
 the information. The session handler provides a method called
-:method:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\PdoSessionHandler::createTable`
+:method:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\PdoSessionHandler::createTable`
 to set up this table for you according to the database engine used::
 
     try {