Update README.rst

Author: astorfi

TensorFlow/machine_learning_basics/logistic_regression/README.rst

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-Linear Regression
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+Logistic Regression
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 This document is dedicated to explain how to run the python script for this tutorial. ``Logistic regression`` is a binary
 classification algorthim in which `yes` or `no` are the only possible responses. The linear output is transformed to a probability of course between zero and 1. The decision is made by thresholding the probability and saying it belongs to which class. We consider ``Softmax`` with ``cross entropy`` loss for minimizing the loss.