Description:
------------
ARG_INFO of several methods of DateTime class have $object as the first 
parameter, which, actually, is not needed in object-oriented API.

Reproduce code:
---------------
php --rc DateTime

Expected result:
----------------
?
Method [ <internal:date> public method setISODate ] {

      - Parameters [4] {
        Parameter #0 [ <required> $year ]
        Parameter #1 [ <required> $week ]
        Parameter #2 [ <optional> $day ]
      }
    }
?

Actual result:
--------------
?
Method [ <internal:date> public method setISODate ] {

      - Parameters [4] {
        Parameter #0 [ <required> $object ]
        Parameter #1 [ <required> $year ]
        Parameter #2 [ <required> $week ]
        Parameter #3 [ <optional> $day ]
      }
    }
?