[docs] Addition to the sockets howto.

[Peter Barandat]

Hello,

I'm new to python and am trying to create a program that uses sockets.
For this I'm basing myself on : http://docs.python.org/2/howto/sockets.html.

I'd like to propose a small clarification for this page.  Namely to 
state explicitly that the programmer has to "import socket" before 
sockets can be used.
I realise this is probably second nature for those having a bit of 
experience with python. For me, as a newbie, this extra bit of info 
would have helped me a lot.

Regards,
Peter