Fix typsetting and content of llm_tutorial_optimization.md

[cyyever]

What does this PR do?

Fix latex, markdown * escaping and white space. Some errors in the content are also fixed.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

[cyyever]

@stevhliu Many changes in this PR. I have verified the typesetting by converting it into html.
There are other files with Latex typesetting issues, will be fixed in later PRs.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[stevhliu]

The other changes look good, but the Latex formatting seems off!

[cyyever]

I tried pandoc to convert it to pdf, the math formulas worked well.

[stevhliu]

The changes look like this which makes it looks more confusing I think. May be better to revert to how it was previously and try to find a better solution

[cyyever]

@stevhliu Still waiting the $...$ syntax support.