[Question] Missing application/json Content Type in API Specification for DocumentIntelligence

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/ai/data-plane/DocumentIntelligence/stable/2024-11-30/DocumentIntelligence.json

### API Spec version

2024-11-30

### Question/Query

We've encountered a discrepancy regarding the content-type specification for the API. Our understanding, based on both the Document Intelligence documentation (https://learn.microsoft.com/en-us/rest/api/aiservices/document-models/analyze-document?view=rest-aiservices-v4.0%20(2024-11-30)&viewFallbackFrom=rest-aiservices-2023-07-31&preserve-view=true&tabs=HTTP) and direct API testing, is that the Document Intelligence service successfully accepts application/json as a content type.

However, we've observed that application/json is currently not listed as an accepted content-type within the API specification itself.

Is this correct?

### Environment

_No response_

Start with specification/ai/data-plane/DocumentIntelligence/stable/2024-11-30/DocumentIntelligence.json and compare its content-type definition with the linked Document Intelligence documentation. Verify whether the service accepts application/json, then document the confirmed behavior and whether the API specification needs correction.

Written by the indexing model from the issue text.