[docs] [issue15608] Improve socketserver doc

[Terry J. Reedy]

Terry J. Reedy added the comment:

BaseRequestHandler.__init__(self, request) apparently attaches request to the instance as self.request.

The methods are called in this order: setup, handle, finish. 
If they must be confusingly documented in the opposite order, it would be good for the head entry to state the correct order.

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<http://bugs.python.org/issue15608>
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