Message tray is only mentioned once
"message tray" is only mentioned once so it can be hard to know what exactly is the "message tray".
Open <link xref=\"shell-notifications#messagetray\">the message tray</link>.
On the visual introduction page it says "Clock, calendar & appointments". So its being called by what it contains instead of its name.
So maybe change "Clock, calendar & appointments" to "Message tray" if that is the name it is suppose to have.