fix link

Author: PatrickFarley

articles/ai-services/computer-vision/toc.yml

@@ -77,7 +77,7 @@ items:
   - name: Reference
     items:
     - name: OCR REST API v4.0 (preview)
-      href: https://westus.dev.cognitive.microsoft.com/docs/services/unified-vision-apis-public-preview-2022-10-12-preview/operations/61d65934cd35050c20f73ab6
+      href: https://aka.ms/vision-4-0-ref
     - name: OCR REST API v3.2
       href: /rest/api/computervision/operation-groups?view=rest-computervision-v3.2-preview
     - name: OCR REST API v3.1