[docs] missing info for the documentation of set.add()

[Ioannis Tziakos]

Hi All,

I have noticed that there is a difference in the current documentation for
python 2.7.1 and
the doc-string of set.add().

The documentation (http://docs.python.org/library/stdtypes.html#set) reads

--------
add(elem)
	Add element elem to the set.
--------


While python 2.7.1 doc string provides additional info

--------
Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> help(set.add)
Help on method_descriptor:

add(...)
       Add an element to a set.

       This has no effect if the element is already present.

>>>
--------


Regards,
Ioannis Tziakos