Document multipart model handling for image edits

[akhilmmenon]

Summary

• Added provider-neutral guidance for /v1/images/edits multipart requests.
• Clarified that callers should pass the upstream provider’s model or deployment name directly in the multipart model field.
• Documented that Portkey does not rewrite provider-prefixed model aliases inside multipart payloads because they can contain large binary files.

Test plan

• Verified the updated MDX files have no editor lint errors.
• Confirmed the caveat is documented in both the image generation guide and the image edit API reference.

[Copilot]

Pull request overview

Adds Azure OpenAI image editing guidance to the Azure OpenAI integration docs, focusing on multipart (multipart/form-data) behavior and the requirement to pass the Azure deployment/model name directly in the multipart model field (without provider-prefixed aliases).

Changes:

• Documented Azure OpenAI image editing usage and constraints for multipart requests.
• Added an example showing the correct model value and a counterexample with a provider-prefixed alias.
• Added a note explaining why Portkey does not rewrite model aliases inside multipart payloads.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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[sivadurga-d]

For image edit you can give add a section and example, then below just put note @provider/modelname in request body is not supported.

[sivadurga-d]

do not add here.