Add article tags callout to Unstable (0) version

Missed this version in the initial commit — aligns with the developer-docs
@unstable spec which already has the callout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: markdennis22

descriptions/0/api.intercom.io.yaml

@@ -1041,7 +1041,10 @@ paths:
       tags:
       - Articles
       operationId: createArticle
-      description: You can create a new article by making a POST request to `https://api.intercom.io/articles`.
+      description: "You can create a new article by making a POST request to `https://api.intercom.io/articles`.\n\n>
+        \U0001F4D8 Tags cannot be managed via the Articles API\n>\n> Article tags are
+        read-only in responses. To create, update, or delete tags, use the Intercom
+        UI or the Tags API endpoints.\n"
       responses:
         '200':
           description: article created
@@ -1236,8 +1239,11 @@ paths:
       tags:
       - Articles
       operationId: updateArticle
-      description: You can update the details of a single article by making a PUT
-        request to `https://api.intercom.io/articles/<id>`.
+      description: "You can update the details of a single article by making a PUT
+        request to `https://api.intercom.io/articles/<id>`.\n\n> \U0001F4D8 Tags cannot be
+        managed via the Articles API\n>\n> Article tags are read-only in responses.
+        To create, update, or delete tags, use the Intercom UI or the Tags API
+        endpoints.\n"
       responses:
         '200':
           description: successful