fix: documentation of `multiset_permutations`

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ac70c46) 96.97% compared to head (d27455c) 96.89%. Report is 13 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #141 +/- ## ========================================== - Coverage 96.97% 96.89% -0.09% ========================================== Files 7 8 +1 Lines 728 804 +76 ========================================== + Hits 706 779 +73 - Misses 22 25 +3 ```

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[kunzaatko]

OK, so now the documentation shows the option with two arguments instead of three at the beginning, which is correct, if I understand you correctly?