Re-structure torch_geometric.nn.aggr and torch_geometric.nn.norm documentation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6445 (2187b28) into master (2d26745) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6445   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files         402      402           
  Lines       21682    21682           
=======================================
+ Hits        18452    18453    +1     
+ Misses       3230     3229    -1     

Impacted Files	Coverage Δ
torch_geometric/nn/aggr/base.py	95.65% <ø> (ø)
torch_geometric/nn/norm/batch_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/diff_group_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/graph_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/graph_size_norm.py	93.33% <ø> (ø)
torch_geometric/nn/norm/layer_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/mean_subtraction_norm.py	100.00% <ø> (+7.14%)	⬆️
torch_geometric/nn/norm/msg_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/pair_norm.py	100.00% <ø> (ø)
torch_geometric/nn/norm/instance_norm.py	100.00% <100.00%> (ø)

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