Improve geometry docs

[joamatab]

• add more docs to fix Corner Rounding, Offset and Outline Operations #2844
• fix tests

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (7bd4017) to head (314a7cd).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2845      +/-   ##
==========================================
+ Coverage   68.63%   68.68%   +0.04%     
==========================================
  Files         296      298       +2     
  Lines       15235    15259      +24     
  Branches     2229     2229              
==========================================
+ Hits        10457    10481      +24     
  Misses       4183     4183              
  Partials      595      595              

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