DMoNPooling: Doc and clean-up

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4242 (065fcca) into master (592ca50) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4242      +/-   ##
==========================================
+ Coverage   82.66%   82.67%   +0.01%     
==========================================
  Files         309      309              
  Lines       15837    15838       +1     
==========================================
+ Hits        13091    13094       +3     
+ Misses       2746     2744       -2     

Impacted Files	Coverage Δ
torch_geometric/nn/dense/diff_pool.py	100.00% <ø> (ø)
torch_geometric/nn/dense/mincut_pool.py	100.00% <ø> (ø)
torch_geometric/nn/dense/__init__.py	100.00% <100.00%> (ø)
torch_geometric/nn/dense/dmon_pool.py	98.00% <100.00%> (ø)
torch_geometric/nn/models/mlp.py	98.41% <0.00%> (+3.17%)	⬆️

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