Fix: llmConfig typo in llm-strategies.md

[AInseven]

Summary

fix typo of llm_config in LLMExtractionStrategy fix typo of LLMConfig in crawl4ai

List of files changed and why

llm-strategies.md

How Has This Been Tested?

YES.

Checklist:

• [ ] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added/updated unit tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes