Chore: Typo fixed in multiple files of docs/source/en/model_doc
Author: SusheelThapa
Pull request: yes

# What does this PR do?

This PR fix the typo present in the files inside `docs/source/en/model_doc` folder

```pseudo
optimizaton > optimization
Similiar > Similar
exaclty > exactly
conditionning > conditioning
outupt > output
avalable > avaliable
```
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## Before submitting
- [X] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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## Who can review?

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Models:

- text models: @ArthurZucker and @younesbelkada
- vision models: @amyeroberts
- speech models: @sanchit-gandhi
- graph models: @clefourrier

Library:

- flax: @sanchit-gandhi
- generate: @gante
- pipelines: @Narsil
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @pacman100

Integrations:

- deepspeed: HF Trainer/Accelerate: @pacman100
- ray/raytune: @richardliaw, @amogkam
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Documentation: @stevhliu and @MKhalusova

HF projects:

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- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

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Comments:
@a-r-r-o-w  Can you review again?

Hey! Feel free to ping me when this is ready! 

@ArthurZucker Can you review this PR and provide me necessary feedback?

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_26833). All of your documentation changes will be reflected on that endpoint.