Update Manage-users.md
partially completed new url-upload endpoint specs
Update Manage-users.md

Finished adding new endpoint sample output.
Update Manage-users.md

Fixed some grammar.
Update Manage-users.md

Made some changes to keep output consistent across endpoints.
Merge pull request #2 from synappio/rp-add-list_slug-import-endpoint

Rp add list slug import endpoint