MAINT: update docstring and clean typing comments

[martinfleis]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.36%. Comparing base (9a5e330) to head (242fc3c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
gwlearn/ensemble.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files           6        6           
  Lines         799      799           
=======================================
  Hits          730      730           
  Misses         69       69           

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