docs: build 3.2.0 release notes

[d-v-b]

[Description of PR]

TODO:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/user-guide/*.md
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.27%. Comparing base (870fabd) to head (1d834ee).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3932      +/-   ##
==========================================
+ Coverage   91.46%   93.27%   +1.80%     
==========================================
  Files          87       87              
  Lines       11676    11676              
==========================================
+ Hits        10680    10891     +211     
+ Misses        996      785     -211     

see 6 files with indirect coverage changes

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