Update file-downloads-tracking.md

updated noted to include link

Author: bogplau

docs/file-downloads-tracking.md

@@ -52,7 +52,7 @@ Want to group file downloads by the domain name or any other keyword? In the "**
 ## Which file types are tracked?
 
 :::note
-Automatic file download tracking only works for files hosted on the same domain as the tracked site. Files served from a CDN, another domain, or an untracked subdomain will be tracked as outbound link clicks instead.
+Automatic file download tracking only works for files hosted on the same domain as the tracked site. Files served from a CDN, another domain, or an untracked subdomain will be tracked as [outbound link clicks](https://plausible.io/docs/outbound-link-click-tracking) instead.
 :::
 
 Our "**File downloads**" tracking captures a file download event each time a link is clicked with a document, presentation, text file, compressed file, video, audio or other common file type. Both internal and external files downloads are tracked. These file extensions are tracked by default: