You're seeing just the function
rename, go back to Slack.Web.Channels module for more information.
Renames a channel.
channel- Channel to rename
name- New name for channel.
Errors the API can return:
channel_not_found- Value passed for
invalid_name- New name is invalid
name_taken- New channel name is taken
not_authorized- Caller cannot rename this channel
not_in_channel- Caller is not a member of the channel.