Minor documentation fixes in models.encodings + fix coverage

[renatomello]

Tidying up after the unitaryHACK 2025.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.15%. Comparing base (3b2c015) to head (99ecd56).
Report is 109 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1666   +/-   ##
=======================================
  Coverage   99.14%   99.15%           
=======================================
  Files          80       80           
  Lines       12257    12268   +11     
=======================================
+ Hits        12152    12164   +12     
+ Misses        105      104    -1     

Flag	Coverage Δ
unittests	99.15% <100.00%> (+<0.01%)	⬆️

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[renatomello]

@BrunoLiegiBastonLiegi can you take a look at this PR? Now it is also fixing the coverage issues leftover from #1653.