test sphinx mapping to networkx

[raybellwaves]

Closes https://github.com/rapidsai/cugraph/issues/4285

I'll report back if it get to render locally. Ran out of mem building the library on my ec2 machine (g5.2xlarge: 32 Gb RAM) but I did just build cudf. I'll try again soon.

~~Also brainstorming here and I probably should upstream this to the rapids CI process. Would be nice to have /ok to test docs which just builds the docs for this PR~~ created https://github.com/nv-gha-runners/nvidia-runners/issues/25

I tried building the docs locally and got

WARNING: [autosummary] failed to import cugraph.jaccard_w.
Possible hints:
* AttributeError: module 'cugraph' has no attribute 'jaccard_w'
* ImportError: 
* ModuleNotFoundError: No module named 'cugraph.jaccard_w'
WARNING: [autosummary] failed to import cugraph.overlap_w.
Possible hints:
* ModuleNotFoundError: No module named 'cugraph.overlap_w'
* ImportError: 
* AttributeError: module 'cugraph' has no attribute 'overlap_w'
WARNING: [autosummary] failed to import cugraph.sorensen_w.
Possible hints:
* ModuleNotFoundError: No module named 'cugraph.sorensen_w'
* ImportError: 
* AttributeError: module 'cugraph' has no attribute 'sorensen_w'

Think this comes from https://github.com/rapidsai/cugraph/blob/abe69c0419b67b567d3c8fce91ee1a062d53e385/docs/cugraph/source/api_docs/cugraph/link_prediction.rst#L14

but I may have messed up my build