docs: Improvements on provider_codegen for type hints and multi-line yaml descriptions

[thepetk]

What does this PR do?

This PR improves type hint cleanup in auto-generated provider documentation by adding regex logic.

Issues Fixed:

• Type hints with missing closing brackets (e.g., list[str instead of list[str])
• Types showing as <class 'bool'>, <class 'str'> instead of bool, str
• The multi-line YAML frontmatter in index documentation files wasn't ideal, so we now add the proper | character.

Changes:

1. Replaced string replacement (.replace) with regex-based type cleaning to preserve the trailing bracket in case of list and dict.
2. Adds the | character for multi-line YAML descriptions.
3. I have regenerated the docs. However, let me know if that's not needed.

Test Plan

1. Ran uv run python scripts/provider_codegen.py - successfully regenerated all docs
2. We can see that the updated docs handle correctly type hint cleanup and multi-line yaml descriptions have now the | character.

Note to the reviewer(s)

This is my first contribution to your lovely repo! Initially I was going thourgh docs (wanted to use remote::gemini as provider) and realized the issue. I've read the CONTRIBUTING.md and decided to open the PR. Let me know if there's anything I did wrong and I'll update my PR!

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[mergify]

This pull request has merge conflicts that must be resolved before it can be merged. @thepetk please rebase it. https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[ashwinb]

this is great thank you. so much better!

[thepetk]

this is great thank you. so much better!

@ashwinb thanks for approving, I have a small issue with the pre-commit check, as the check fails. Pushed
0912fbe too as it seems that my profile imported as a default value when I generated again the docs (might worth looking into it in a separate PR)