Add mermaid and explanation to openai guide

[karansohi]

Description of change

Checklist

• [ ] Tested in playground or other setup
• [ ] Screenshot (Grafana) from playground added to PR for 15+ minute run
• [ ] Documentation is changed or added
• [ ] Tests and/or benchmarks are included
• [ ] Breaking changes

Summary by CodeRabbit

• Documentation
  • Updated the guide with a new graph illustrating request scheduling using Aperture.
  • Added an explanation of request prioritization and execution.
  • Removed the code snippet for OpenAI API calls using Aperture Client methods.

[coderabbitai[bot]]

Walkthrough

The documentation for OpenAI has been updated to include a new graph that illustrates how request scheduling is managed using Aperture. It also provides a concise explanation of the request prioritization and execution process. Additionally, a code snippet that previously demonstrated how to make an OpenAI API call using Aperture Client's StartFlow and End methods has been removed.

Changes

File	Summary
docs/content/guides/openai.md	Added a graph depicting request scheduling with Aperture and a brief explanation of request prioritization and execution; removed a code snippet for OpenAI API call using Aperture Client.

🐇✨ To code, to build, a graph takes flight, Through Aperture's lens, requests in sight. Prioritize, execute, the flow is clear, CodeRabbit hops on, with changes to cheer! 🎉 🐇💻

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