TDD prep: redocument() with new roxygen

[simonpcouch]

Also ensures that GHA are running fine.

[simonpcouch]

cc @topepo, there's a test here called "one player is really bad" that's now failing with:

── Failure ('test-win-loss-overall.R:92:3'): one player is really bad ──────────
nrow(best_res) == 1 is not TRUE

`actual`:   FALSE
`expected`: TRUE 

best_res actually looks like:

best_res
#> # A tibble: 2 × 7
#>   min_n .metric .estimator  mean     n std_err .config             
#>   <dbl> <chr>   <chr>      <dbl> <int>   <dbl> <chr>               
#> 1   400 roc_auc binary     0.820    10  0.0231 Preprocessor1_Model2
#> 2     1 roc_auc binary     0.815    10  0.0185 Preprocessor1_Model1

Any intuition?