docs: add a note to add openai credits

[tchia04]

📑 Description

Resolves the issue openapi API quota issue as discussed in the slack channel

Error: exhausted API quota for AI provider openai: error, status code: 429, message: You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.

✅ Checks

• [X] My pull request adheres to the code style of this project
• [X] My code requires changes to the documentation
• [X] I have updated the documentation as required
• [X] All the tests have passed

ℹ Additional Information

@AlexsJones

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[AlexsJones]

Thanks for the contribution @tchia04 Can you please restructure it to be a bit simpler to read?

E.g.

If you see this error message: "...." 
Then do this...

Also it looks to be h1 size text, might be worth checking it's not too large.

Thanks!