Correct a typo

[tonymazn]

On 8.7 "We modify our notation slightly to make it clear that the the predicted value is a function of", there is double words "the", I tested on IE and Chrome, both displayed double "the".

[coatless]

@tonymazn thanks! Is there anyway you could fix it via a PR?

To modify it on GitHub press the "edit" button.

Then find the typo:

From there:

1. Fix the typo.
2. Describe what changed
3. Select create a new branch for this commit and start a pull request (PR)
4. Then press the green commit button.

[tonymazn]

Hi coatless,

I commented a change couple minutes ago..

Thank you
Tony

[coatless]

@tonymazn awesome thanks! @daviddalpiaz will merge in #80 shortly.

Feel free to follow the above advice if you find more typos!

Thanks again!