New Features
Content Mentions GA
Prefix search for auto-suggest
Message Editor v2 (Early Access)
Better visual display for code samples
In-line image editing
Streamlined editing pane ...
Updated 6 months ago
Version 11.0
Blog Post
louisamartin
As it is a new email template, you will have to make the desired changes as done for other templates.
From the release note:
To view and edit the @Mention Content Notification template: Sign in to Community and go to Studio. Go to Text Editor > Email Text. Select @Mention Content Notification from the email template drop-down list. Click View. Make changes to the email text as needed and click Save.