Task: The Manual:Echo page  intends to give a complete list of when mention are being sent out. This list should be updates according to our learnings + changes and be as understandable as possible.
Please update the link, taking into account
- T138080: Also send mention notifications to self
- T137896: Investigate signature problems and mention failure notifications
- T137897: Investigate case where no mention happens due to section mismatch
Furthermore, we should mention the new notifications (but on which page?)