Convert docstrings to numpydoc style

[rocco8773]

Convert all docstrings from the reST style to the numpydoc style.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.50%. Comparing base (1acd0d1) to head (aa9924c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files          47       47           
  Lines        3076     3076           
  Branches      580      580           
=======================================
  Hits         3030     3030           
  Misses         44       44           
  Partials        2        2           

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