Document argument is_open in ManifoldSubset.complement and difference

[egourgoulhon]

📚 Document argument is_open of methods complement and difference in ManifoldSubset

The argument is_open was not documented in the docstrings of ManifoldSubset.complement and ManifoldSubset.difference

📝 Checklist

• [x ] I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• [ x] I have created tests covering the changes.
• [ x] I have updated the documentation accordingly.

⌛ Dependencies

[codecov-commenter]

Codecov Report

Base: 88.59% // Head: 88.59% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f02b32b) compared to base (104dde9).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35040   +/-   ##
========================================
  Coverage    88.59%   88.59%           
========================================
  Files         2136     2136           
  Lines       396142   396142           
========================================
+ Hits        350948   350963   +15     
+ Misses       45194    45179   -15     

Impacted Files	Coverage Δ
src/sage/manifolds/subset.py	94.19% <ø> (ø)
src/sage/rings/polynomial/pbori/parallel.py	59.82% <0.00%> (-1.79%)	⬇️
src/sage/modular/hecke/algebra.py	94.65% <0.00%> (-1.07%)	⬇️
src/sage/categories/weyl_groups.py	96.47% <0.00%> (-0.59%)	⬇️
src/sage/modular/arithgroup/congroup_gamma0.py	94.41% <0.00%> (-0.56%)	⬇️
src/sage/graphs/generic_graph.py	89.04% <0.00%> (-0.50%)	⬇️
src/sage/modular/overconvergent/hecke_series.py	98.76% <0.00%> (-0.31%)	⬇️
src/sage/graphs/generators/random.py	91.95% <0.00%> (-0.18%)	⬇️
src/sage/graphs/digraph.py	92.58% <0.00%> (-0.13%)	⬇️
src/sage/schemes/elliptic_curves/ell_point.py	84.51% <0.00%> (-0.12%)	⬇️
... and 18 more

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[tobiasdiez]

LGTM

[egourgoulhon]

Thank you Tobias for the review!

[egourgoulhon]

Thank you Matthias for the review!