add pricing page link

Author: laujan

articles/ai-services/content-understanding/faq.yml

@@ -66,4 +66,4 @@ sections:
       - question: |
          What are the pricing tier options for Content Understanding
         answer: |
-          Content Understanding only supports Standard S0 pricing tier. See more details on the pricing page.
+          Content Understanding only supports Standard S0 pricing tier. See more details on the [**Content Understanding pricing page**](https://azure.microsoft.com/pricing/details/content-understanding/).

articles/ai-services/content-understanding/toc.yml

@@ -18,6 +18,8 @@ items:
     href: service-limits.md
   - name: Language and region support
     href: language-region-support.md
+  - name: Pricing
+    href: https://azure.microsoft.com/pricing/details/content-understanding/
   - name: FAQ
     displayName: FAQ, definition, updates, previews
     href: faq.yml