explicitly state the nested resampling strategy in example

[nickreich]

https://mlr3book.mlr-org.com/nested-resampling.html#nested-resamp-exec

In section 3.3, it is really helpful to revisit the example from earlier in section 3.1. However, it would be even more helpful, now that nested resampling has been explained in nice detail, to link the code in the example with explicit statements about how many inner/outer resamplings this particular code specifies.

E.g. I understand it that resampling_outer = rsmp("cv", folds = 3) specifies three outer resamplings, but where are the inner resamplings specified (if they are specified at all) here?

Just a simple sentence like "The above code runs an analysis with three outer resamplings with rsmp(..., folds=3), and XX number of inner resamplings, [specified with/implied by default by] ????." would help a lot.