docs: Update README.md (Typo "Azure Open AI"→"Azure OpenAI")

[hyoshioka0128]

Purpose

• Typo "Azure Open AI"→"Azure OpenAI"
• https://github.com/microsoft/Conversation-Knowledge-Mining-Solution-Accelerator/blob/main/README.md
• #PingMSFTDocs

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[Avijit-Microsoft]

Hi @hyoshioka0128,
The file has been modified by another contributor, resulting in a conflict with your PR. Thank you again for your time and valuable contribution.