adding link for previous APIs

Author: aahill

articles/ai-services/openai/how-to/assistant.md

@@ -24,7 +24,7 @@ Azure OpenAI Assistants (Preview) allows you to create AI assistants tailored to
 
 ### Region, model, and API support
 
-The [models page](../concepts/models.md#assistants-preview) contains the most up-to-date information on regions/models where Assistants are currently supported. Assistants can be used in version `2024-02-15-preview` and later of the Azure OpenAI preview API.
+The [models page](../concepts/models.md#assistants-preview) contains the most up-to-date information on regions/models where Assistants are currently supported. Assistants can be used in version `2024-02-15-preview` and later of the Azure OpenAI inference [preview API](../reference-preview#api-specs). A full list of previous API versions can be found on [GitHub](https://github.com/Azure/azure-rest-api-specs/tree/main/specification/cognitiveservices/data-plane/AzureOpenAI/inference/preview).
 
 ### Supported file types