Re-structure torch_geometric.transforms documentation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6443 (db3e98c) into master (6fa2ee7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6443   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files         402      402           
  Lines       21680    21682    +2     
=======================================
+ Hits        18450    18452    +2     
  Misses       3230     3230           

Impacted Files	Coverage Δ
torch_geometric/transforms/add_metapaths.py	98.44% <ø> (ø)
torch_geometric/transforms/base_transform.py	100.00% <ø> (ø)
torch_geometric/transforms/center.py	100.00% <ø> (ø)
torch_geometric/transforms/fixed_points.py	100.00% <ø> (ø)
torch_geometric/transforms/grid_sampling.py	100.00% <ø> (ø)
torch_geometric/transforms/knn_graph.py	100.00% <ø> (ø)
...orch_geometric/transforms/linear_transformation.py	91.66% <ø> (ø)
torch_geometric/transforms/radius_graph.py	100.00% <ø> (ø)
torch_geometric/transforms/sample_points.py	100.00% <ø> (ø)
torch_geometric/transforms/to_sparse_tensor.py	97.14% <ø> (ø)
... and 2 more

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