Updating DALL-E 3 API docs

Author: Derek Legenzoff

articles/ai-services/openai/reference.md

@@ -609,7 +609,7 @@ POST https://{your-resource-name}.openai.azure.com/openai/{deployment-id}/images
 | Parameter | Type | Required? | Default | Description |
 |--|--|--|--|--|
 | `prompt` | string | Required |  | A text description of the desired image(s). The maximum length is 1000 characters. |
-| `n` | integer | Optional | 1 | The number of images to generate. Must be between 1 and 5. |
+| `n` | integer | Optional | 1 | The number of images to generate. Only `n=1` is supported for DALL-E 3. |
 | `size` | string | Optional | `1024x1024` | The size of the generated images. Must be one of `1792x1024`, `1024x1024`, or `1024x1792`. |
 | `quality` | string | Optional | `standard` | The quality of the generated images. Must be `hd` or `standard`. |
 | `imagesResponseFormat` | string | Optional | `url` | The format in which the generated images are returned Must be `url` (a URL pointing to the image) or `b64_json` (the base 64 byte code in JSON format). |