Fix #1340 - Use generic from_edgelist() methods

[miguelusque]

Hi!

I have updated this notebook to make use of the new generic from_edgelist() methods. I have also updated the notebook to mention that graphs can be created from cudf, dask_cudf and Pandas dataframes.

Hope it helps!

Regards,
Miguel

closes #1340

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Codecov Report

Merging #1341 (d623962) into branch-0.18 (2fb0725) will increase coverage by 0.09%.
The diff coverage is 31.81%.

@@               Coverage Diff               @@
##           branch-0.18    #1341      +/-   ##
===============================================
+ Coverage        60.38%   60.47%   +0.09%     
===============================================
  Files               67       67              
  Lines             3029     3044      +15     
===============================================
+ Hits              1829     1841      +12     
- Misses            1200     1203       +3     

Impacted Files	Coverage Δ
python/cugraph/structure/graph.py	67.18% <0.00%> (+0.38%)	⬆️
python/cugraph/utilities/utils.py	66.92% <18.18%> (-4.63%)	⬇️
python/cugraph/dask/common/input_utils.py	23.07% <28.57%> (+1.14%)	⬆️
python/cugraph/dask/common/mg_utils.py	37.50% <38.09%> (-2.50%)	⬇️
python/cugraph/structure/number_map.py	58.12% <50.00%> (+2.16%)	⬆️
...ython/cugraph/centrality/betweenness_centrality.py	100.00% <100.00%> (ø)

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