Add note on parallel warning

[mayer79]

This PR adds a hint to the docstring of kernelshap() and permshap() that the warning about random seeds in parallel mode can safely be ignored, thanks Implements #163 for reporting.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.83%. Comparing base (af75928) to head (cbdbaa5).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   96.83%   96.83%           
=======================================
  Files           7        7           
  Lines         664      664           
=======================================
  Hits          643      643           
  Misses         21       21           

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