[Code Coverage] models/test_correct_and_smooth.py

[zechengz]

Add tests for CorrectAndSmooth
Minor documentation fix
Also minor fix of smooth in CorrectAndSmooth to avoid changing the y_soft tensor in the smooth function

[codecov]

Codecov Report

Merging #6637 (8187e3c) into master (a5e5a48) will increase coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head 8187e3c differs from pull request most recent head aaa44c2. Consider uploading reports for the commit aaa44c2 to get more accurate results

@@            Coverage Diff             @@
##           master    #6637      +/-   ##
==========================================
+ Coverage   87.56%   87.70%   +0.14%     
==========================================
  Files         422      422              
  Lines       22886    22887       +1     
==========================================
+ Hits        20040    20074      +34     
+ Misses       2846     2813      -33     

Impacted Files	Coverage Δ
torch_geometric/nn/models/correct_and_smooth.py	100.00% <100.00%> (+76.74%)	⬆️

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