Deprecate model customization feature

Author: PatrickFarley

articles/ai-services/computer-vision/overview-image-analysis.md

@@ -46,7 +46,7 @@ You can analyze images to provide insights about their visual features and chara
 
 | Name | Description | Concept page |
 |---|---|---|
-|**Model customization** (v4.0 preview only) |You can create and train custom models to do image classification or object detection. Bring your own images, label them with custom tags, and Image Analysis trains a model customized for your use case.|[Model customization](./concept-model-customization.md)|
+|**Model customization** (v4.0 preview only) (approaching deprecation) |You can create and train custom models to do image classification or object detection. Bring your own images, label them with custom tags, and Image Analysis trains a model customized for your use case.|[Model customization](./concept-model-customization.md)|
 |**Read text from images** (v4.0 only)| Version 4.0 preview of Image Analysis offers the ability to extract readable text from images. Compared with the async Computer Vision 3.2 Read API, the new version offers the familiar Read OCR engine in a unified performance-enhanced synchronous API that makes it easy to get OCR along with other insights in a single API call. |[OCR for images](concept-ocr.md)|
 |**Detect people in images** (v4.0 only)|Version 4.0 of Image Analysis offers the ability to detect people appearing in images. The bounding box coordinates of each detected person are returned, along with a confidence score. |[People detection](concept-people-detection.md)|
 |**Generate image captions** | Generate a caption of an image in human-readable language, using complete sentences. Computer Vision's algorithms generate captions based on the objects identified in the image. <br/><br/>The version 4.0 image captioning model is a more advanced implementation and works with a wider range of input images. It's only available in the certain geographic regions. See [Region availability](#region-availability). <br/><br/>Version 4.0 also lets you use dense captioning, which generates detailed captions for individual objects that are found in the image. The API returns the bounding box coordinates (in pixels) of each object found in the image, plus a caption. You can use this functionality to generate descriptions of separate parts of an image.<br/><br/>:::image type="content" source="Images/description.png" alt-text="Photo of cows with a simple description on the right.":::| [Generate image captions (v3.2)](concept-describing-images.md)<br/>[(v4.0)](concept-describe-images-40.md)|