Forum user found an issue where if they select the documentation link for "", then they are brought to a 404 page instead of the correct documentation page.
The url that it is linking to is: https://forums.unrealengine.com/showthread.php?89414-Matinee-Broken-documentation-URL
It should be linking to: [Link Removed]
This is found in the help menu within the Matinee window.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-22694 in the post.