[BUG] Broken Link on `aggregation` document

[johnsturgeon]

Describe the bug
There is a broken link on the aggretation page documednt

To Reproduce

Go to: https://github.com/BeanieODM/bunnet/blob/main/docs/tutorial/aggregate.md
See:

A full list of available methods can be found here.

Click on here

Expected behavior
Not to 404