[Document] Add (or update) an example to demonstrate converting node/edge attributes in from_networkx

[komo-fr]

Add (or update) an example to demonstrate converting node/edge attributes in from_networkx.

Related an issue/PR:

• Issue [Feature Request] In the function ‘from_networkx’, convert NetworkX node/edge attributes to Bokeh node_renderer/edge_renderer data_source. #8183
• PR Convert NetworkX node/edge attributes to Bokeh node_renderer/edge_renderer data source. (#8183) #8210

I think that it is easier to understand that node / edge attributes are being converted in from_networkx by adding an example that displays node hover information at the end of this page.
Visualizing Network Graphs
https://bokeh.pydata.org/en/latest/docs/user_guide/graph.html

Draft

The example draft to be added is as follows.
http://nbviewer.jupyter.org/github/komo-fr/networkx2bokeh_note/blob/master/notebooks/graph_example_hovering_node_attributes.ipynb

If there is not particularly big problem with this content, I will send a PR.

[bryevdv]

@komo-fr That looks like a nice example, would be glad to accept a PR to add it.

[codercahol]

It would also be very helpful if the procedure for accessing edge attributes / labelling them was more clearly documented

[komo-fr]

@bryevdv
Thank you for the reply.
I added an example that uses edge attributes for a comment from @codercahol.

Draft 2
http://nbviewer.jupyter.org/github/komo-fr/networkx2bokeh_note/blob/master/notebooks/graph_example_using_node_and_edge_attributes.ipynb?flush_cache=true

In order to display the node / edge attributes in node_renderer / edge_renderer as a label, it seems that GraphRenderer itself needs additional modification.
Therefore, it is not shown in the example above.
Instead, I added codes to change the edge color using edge attributes.

I sent a PR with this content, so I would like to discuss it there.