single char ` addition for docs

[nbroad1881]

What does this PR do?

I think this will fix the docs from being weirdly formatted. All the sections after MAX_TOP_N_TOKENS don't show up in the bar on the right (https://huggingface.co/docs/text-generation-inference/basic_tutorials/launcher#maxtopntokens)

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?

@merveenoyan

[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.

[Narsil]

Thanks a lot !