Add descriptive docstring to TemperatureLogitsWarper
Author: nablabits
Pull request: yes

# What does this PR do?

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Fixes one of the cases in https://github.com/huggingface/transformers/issues/24783


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).


## Who can review?
@gante


## Notes
My first PR to this library, greatly appreciate your patience :wink: 

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- text models: @ArthurZucker and @younesbelkada
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Comments:
Please note that I force pushed the branch as I had to fix the linter (and took the advantage to sync my fork).

In case someone else runs into the same problem (and by some planetary alignment :ringed_planet: :earth_africa: :new_moon:  lands in this tiny comment), it took me a while to figure out the issue as `make quality` was failing without fixing anything, and `make style` was fixing the wrong thing. This is what it was failing:
```python
>>> some_python_code = 1
Some output of above prompt

This kind of text shouldn't be here

>>> some_other_python_code = 2
```

_The documentation is not available anymore as the PR was closed or merged._

> That is a great example @nablabits! :fire: 
> 
> Thank you for iterating on it, I've requested a few minor changes (to further improve information density), and it should be ready to merge after they are addressed :hugs: 

Hi @gante, thanks for your patience, guidance and support, much appreciated :hugs: . I greatly enjoyed the learning experience. Are you happy for me to pick something else in the list (I'd like to deepen in my knowledge of this tiny bit of the platform) or the protocol suggests that I should leave remaining tasks for other folks?


@nablabits feel free to pick more tasks from the list, as many as you want (one at a time, of course) -- as long as you confirm that no one is working on a given task and that you share on the issue that you've decided to take it 🤗