single char ` addition for docs (#1989)

# 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
- [x] 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](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the
[forum](https://discuss.huggingface.co/)? 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](https://github.com/huggingface/transformers/tree/main/docs),
and
[here are tips on formatting
docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation

).
- [ ] Did you write any new necessary tests?


## Who can review?

@merveenoyan

---------
Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

docs/source/basic_tutorials/launcher.md

@@ -125,7 +125,7 @@ Options:
 ## MAX_TOP_N_TOKENS
 ```shell
       --max-top-n-tokens <MAX_TOP_N_TOKENS>
-          This is the maximum allowed value for clients to set `top_n_tokens`. `top_n_tokens is used to return information about the the `n` most likely tokens at each generation step, instead of just the sampled token. This information can be used for downstream tasks like for classification or ranking
+          This is the maximum allowed value for clients to set `top_n_tokens`. `top_n_tokens` is used to return information about the the `n` most likely tokens at each generation step, instead of just the sampled token. This information can be used for downstream tasks like for classification or ranking
           
           [env: MAX_TOP_N_TOKENS=]
           [default: 5]

launcher/src/main.rs

@@ -236,7 +236,7 @@ struct Args {
     max_stop_sequences: usize,
 
     /// This is the maximum allowed value for clients to set `top_n_tokens`.
-    /// `top_n_tokens is used to return information about the the `n` most likely
+    /// `top_n_tokens` is used to return information about the the `n` most likely
     /// tokens at each generation step, instead of just the sampled token. This
     /// information can be used for downstream tasks like for classification or
     /// ranking.