Update release documentation

[gsheni]

• Follow up to Add workflow to release CTGAN on PyPI #451

Resolves #473

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.46%. Comparing base (d49d437) to head (9dc15c0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   85.46%   85.46%           
=======================================
  Files          11       11           
  Lines         791      791           
=======================================
  Hits          676      676           
  Misses        115      115           

Flag	Coverage Δ
integration	85.33% <ø> (ø)
unit	68.77% <ø> (ø)

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