add more details to block contact (#206)

Author: dan0505

descriptions/0/api.intercom.io.yaml

@@ -4756,7 +4756,12 @@ paths:
       tags:
       - Contacts
       operationId: BlockContact
-      description: You can block a single contact.
+      description: |-
+        Block a single contact.
+
+        **Note:** conversations of the contact will also be archived during the process.
+
+        More details in [FAQ: How do I block Inbox spam?](https://www.intercom.com/help/en/articles/8838656-inbox-faqs)
       responses:
         '200':
           description: successful