Doc cleanup for nx-cugraph: fixed typos, cleaned up various descriptions, renamed notebook to match naming convetion.

[rlratzel]

closes #4466

• Fixed typos
• Changed various descriptions to match existing terminology and hopefully clarify
• Renamed notebook to match file name conventions

[review-notebook-app[bot]]

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[rlratzel]

/merge

[aisk]

Packaging changes look OK to me. Hopefully thriftpy2==0.5.2 will be release soon and you'll be able to switch this <= to a !=: Thriftpy/thriftpy2#281 (comment)

Hi, thriftpy2 v0.5.2 has just been released. And I will release a beta version before every thriftpy2 release to avoid breaks in the future. And if anyone has a test environment and want to test the beta release, they can use pip install --pre ... to install the pre-release version of the dependencies and help find the bugs.

[jameslamb]

Thanks very much @aisk ! I've put up #4521 to test cugraph with v0.5.2.