[docs] Lambda Forms' explanation should be improved

[aseem bansal]

In the documentation of Python 2.7.5 I was going through the tutorials and read 4.7.5 Lambda Forms. After reading it I was completely lost about what is this thing. The explanation about features of functional programming being added isn't helpful at all for someone without functional programming experience. The explanation should be improved.

The explanation at codecademy.com at
http://www.codecademy.com/courses/python-beginner-en-KAgt5?curriculum_id=4f89dab3d788890003000096
is better than the official documentation. Perhaps some ideas can be taken from the website?
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