You're seeing just the function update, go back to SlackWeb.Usergroups module for more information.
Link to this function

update(usergroup, optional_params \\ %{})

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Update an existing user group

Required Params

  • usergroup - The encoded ID of the user group to update. ex: S0604QSJC

Optional Params

  • channels - A comma separated string of encoded channel IDs for which the user group uses as a default.
  • description - A short description of the user group.
  • handle - A mention handle. Must be unique among channels, users and user groups.
  • include_count - Include the number of users in the user group. ex: 1
  • name - A name for the user group. Must be unique among user groups. ex: My Test Team