Fix typos and grammar issues in documentation and code
Author: cluster2600
Pull request: yes

# What does this PR do?
Summary

- Fixed Cyrillic 'Р' to Latin 'P' in Portuguese language link (README.md)
- Fixed 'meanginful' to 'meaningful' in training documentation
- Fixed duplicate 'Cohere' reference in modular transformers documentation
- Fixed duplicate 'the the' in trainer and chat command comments

Test plan

-  Verified all typos are corrected
-  Ensured no functional changes to code behavior
-  Maintained existing formatting and structure

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Fixes # (issue)


## 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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Comments:
> Yep, thank you for the fixes! I don't think I would ever have spotted that cyrillic Р - we've been linking users to the Rortuguese language docs this whole time.

You're most welcome!

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_39598). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.