Latexify probit reg demo

[dhruvpatel144]

Description

I have latexified the below figure. Kindly have a look here.

Figure Number

book2 - 15.10

Figures

Before PR	After PR

Issue

945

Steps

• Latexified and adjusted the height the figure.

Checklist

• [x] Performed a self-review of the code
• [x] Tested on Google Colab.

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

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[murphyk]

Please change y-label to 'Negative log-likelihood' and the legend to 'EM' and "BFGS" (capital letters).

[dhruvpatel144]

Done