Fix DiscreteSACExperimentBuilder not exposing with_actor_factory_default

[opcode81]

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Fixes #1248

Additional Changes:

• Add information on Windows-specific developer configuration
• Fix an incorrect docstring

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.29%. Comparing base (c4ae7cd) to head (8b2aae3).

Files with missing lines	Patch %	Lines
tianshou/highlevel/experiment.py	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1250   +/-   ##
=======================================
  Coverage   85.28%   85.29%           
=======================================
  Files         102      102           
  Lines        9078     9083    +5     
=======================================
+ Hits         7742     7747    +5     
  Misses       1336     1336           

Flag	Coverage Δ
unittests	85.29% <83.33%> (+<0.01%)	⬆️

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