Fixed some minor function docstring errors in andes/core/model/model.py

[aaliqureshi]

Fixed docstring errors in model.py file

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov[bot]]

Codecov Report

Merging #325 (a146421) into develop (8a3c284) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #325   +/-   ##
========================================
  Coverage    77.80%   77.80%           
========================================
  Files          166      166           
  Lines        13897    13897           
========================================
  Hits         10813    10813           
  Misses        3084     3084           

Impacted Files	Coverage Δ
andes/core/model/model.py	80.37% <ø> (ø)
andes/routines/tds.py	63.07% <0.00%> (-0.13%)	:arrow_down:
andes/variables/dae.py	69.03% <0.00%> (+0.22%)	:arrow_up:

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[cuihantao]

Thanks!