Parameter to complete the title

[paugier]

Context

It would be nice to be able to have "Exercise 1 (advanced)" or "Exercise 1: do something great". Is it already possible?

Proposal

I guess we would need another parameter (I use subtitle but it might not be very appropriate)

```{exercise}
---
label: ex1
subtitle: " (advanced)"
---
...
```

Tasks and updates

No response

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[paugier]

Looking at the code, I understood that it is already possible to have "Exercise 1 (advanced)"! However, it is not mentioned in the documentation. The supported syntax is:

```{exercise} advanced
---
label: ex1
---
...
```