removed deprecated auto_start setting

Author: fabpot

reference/configuration/framework.rst

@@ -399,8 +399,6 @@ Full Default Configuration
 
             # session configuration
             session:
-                # DEPRECATED! Session starts on demand
-                auto_start:           false
                 storage_id:           session.storage.native
                 handler_id:           session.handler.native_file
                 name:                 ~
@@ -461,9 +459,4 @@ Full Default Configuration
                 file_cache_dir:       %kernel.cache_dir%/annotations
                 debug:                %kernel.debug%
 
-
-.. versionadded:: 2.1
-    The ```framework.session.auto_start`` setting has been removed in Symfony2.1,
-    it will start on demand now.
-
 .. _`protocol-relative`: http://tools.ietf.org/html/rfc3986#section-4.2