Remove non-provider parameters from models

[Kludex]

No description provided.

[hyperlint-ai]

PR Change Summary

Removed non-provider parameters from model initializations to streamline the code and improve clarity.

• Eliminated unnecessary API key parameters from OpenAI and Anthropic model initializations.
• Updated model initialization examples in the documentation to reflect the changes.
• Ensured consistency across model usage by removing redundant parameters.

Modified Files

• docs/api/providers.md
• docs/models.md

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