[yt-dev] Issue #710: yt hub docs need some updating (yt_analysis/yt)

New issue 710: yt hub docs need some updating https://bitbucket.org/yt_analysis/yt/issue/710/yt-hub-docs-need-some-updatin... Nathan Goldbaum: Right now there's no mention of `upload_notebook` and also some discussion about uploading `PlotCollection`. Latest docs build: http://yt-project.org/docs/dev/sharing_data/index.html