[REVIEW] BUG fix benchmark notebooks for recent cudf changes

[BradReesWork]

Fixed benchmark notebooks

Fix docs in graph.py

[review-notebook-app]

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[GPUtester]

Please update the changelog in order to start CI tests.

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[codecov-commenter]

Codecov Report

Merging #1192 into branch-0.16 will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           branch-0.16    #1192      +/-   ##
===============================================
- Coverage        57.41%   57.39%   -0.03%     
===============================================
  Files               61       61              
  Lines             2482     2483       +1     
===============================================
  Hits              1425     1425              
- Misses            1057     1058       +1     

Impacted Files	Coverage Δ
python/cugraph/dask/community/louvain.py	31.81% <0.00%> (-1.52%)	⬇️
python/cugraph/structure/graph.py	64.51% <0.00%> (ø)

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[afender]

Looks good. Just small things like hardcoded "last edit date" are outdated.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (branch-0.16@a4b1bb3). Click here to learn what that means.
The diff coverage is 0.00%.

@@              Coverage Diff               @@
##             branch-0.16    #1192   +/-   ##
==============================================
  Coverage               ?   57.39%           
==============================================
  Files                  ?       61           
  Lines                  ?     2483           
  Branches               ?        0           
==============================================
  Hits                   ?     1425           
  Misses                 ?     1058           
  Partials               ?        0           

Impacted Files	Coverage Δ
python/cugraph/dask/community/louvain.py	31.81% <0.00%> (ø)
python/cugraph/structure/graph.py	64.51% <0.00%> (ø)

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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