Note that the invocation now are aliases

Author: LeSeulArtichaut

src/ice-breaker/about.md

@@ -62,9 +62,14 @@ team. For example:
 @rustbot ping cleanup
 ```
 
+These are aliases that are better rememberable than the full invocation.
+They are declared in the [`triagebot.toml`] file and might be subject to
+changes.
+
 **Note though that this should only be done by compiler team members
 or contributors, and is typically done as part of compiler team
 triage.**
 
 [rustbot]: https://github.com/rust-lang/triagebot/
 [`ping`]: https://github.com/rust-lang/triagebot/wiki/Pinging
+[`triagebot.toml`]: https://github.com/rust-lang/rust/blob/master/triagebot.toml