Fix for Issue #835 Updated notebooks/negative_binomial.html to correct the formula

[tanishy7777]

Updated notebooks/negative_binomial.html to correct the formula from log(Yi) = RHS to log(E(Yi) = RHS where RHS is a linear relationship of features.

Basically instead of
$\log \left( Y_i \right) = \log \left( \mu_i \right) = \beta_1 , \text{Academic}_i + \dots$

it should be

$\log \left( E(Y_i) \right) = \log \left( \mu_i \right) = \beta_1 , \text{Academic}_i + \dots$

Fix for Issue #835

• Code passes tests
• Code passes black
• Code passes pylint

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[tanishy7777]

I have attached the screenshot of the code passing black and pylint after making the changes

Pylint initially showed a score of 9.96/10 because I hadnt installed the 'jax' dependencies (only dev dependencies were installed)

[tomicapretto]

Thanks for the contribution @tanishy7777!