[Agents v1] MessageTextFileCitationDetails : quote is None even though it is defined as required in docs

### Type of issue

Code doesn't work

### Description

According to the documentation, the attribute `quote` is required for the MessageTextFileCitationDetails, however we only ever receive MessageTextFileCitationDetails with `quote == None`, see screenshot.

so either the docs are not correct, or - hopefully - there is a bug in the implementation which should be fixed. We would expect to get the quotes and need them.

### Page URL

https://learn.microsoft.com/en-us/python/api/azure-ai-agents/azure.ai.agents.models.messagetextfilecitationdetails?view=azure-python

### Content source URL

https://github.com/MicrosoftDocs/azure-docs-sdk-python/blob/main/docs-ref-autogen/azure-ai-agents/azure.ai.agents.models.MessageTextFileCitationDetails.yml

### Document Version Independent Id

70c713ff-fe7a-d9c8-29e0-e025b70d773f

### Platform Id

9e38cb5d-5a7a-e564-a22f-11d5cec63a0b

### Article author

@lmazuel

### Metadata

* ID: 5c4bae6e-e259-16eb-8cc5-49edc8a3fe4a
* PlatformId: 9e38cb5d-5a7a-e564-a22f-11d5cec63a0b