Averaged Perceptron documentation format

[jignparm]

Formatting error below "reference" section:

Reference

Wikipedia entry for Perceptron

Large Margin Classification Using the Perceptron Algorithm

<<Discriminative Training Methods for Hidden Markov Models [http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.18.6725](http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.18.6725)_

https://review.docs.microsoft.com/en-us/python/api/nimbusml/nimbusml.linear_model.averagedperceptronbinaryclassifier?view=nimbusml-py-latest&branch=smoke-test&viewFallbackFrom=nimbusml-py