Update openai-embeddings.adoc

[wstever]

update azure openai to openai

Thank you for taking time to contribute this pull request!
You might have already read the [contributor guide][1], but as a reminder, please make sure to:

• Sign the contributor license agreement
• Rebase your changes on the latest main branch and squash your commits
• Add/Update unit tests as needed
• Run a build and make sure all tests pass prior to submission

[tzolov]

Thanks @wstever

[wstever]

谢谢你的邮件，我收到啦