You're seeing just the function unarchive, go back to Slack.Web.Groups module for more information.
Link to this function

unarchive(channel, optional_params \\ %{})

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Unarchives a private channel.

Required Params

  • channel - Private channel to unarchive

Errors the API can return:

  • channel_not_found - Value passed for channel was invalid.
  • not_archived - Group is not archived.