Update account-activity.mdx

Signed-off-by: tcaldwell-x <tcaldwell@twitter.com>

Author: tcaldwell-x

x-api/enterprise-gnip-2.0/fundamentals/account-activity.mdx

@@ -162,7 +162,7 @@ Great job! You should now able to manage your webhooks and subscribed users.
 #### Referenced articles
 
 * [Overview of Challenge-Response Check (CRC)](/x-api/enterprise-gnip-2.0/fundamentals/account-activity#securing-webhooks)
-* [Account Activity Data Types](/x-api/enterprise-gnip-2.0/fundamentals/account-activity#account-activity-data-object-structure
+* [Account Activity Data Types](/x-api/enterprise-gnip-2.0/fundamentals/account-activity#account-activity-data-object-structure)
 * [Managing Webhooks and Subscriptions](/x-api/enterprise-gnip-2.0/fundamentals/account-activity#managing-webhooks-and-subscriptions)