You're seeing just the function
set_topic, go back to SlackWeb.Channels module for more information.
Sets the topic for a channel.
channel- Channel to set the topic of
topic- The new topic ex:
Errors the API can return:
channel_not_found- Value passed for
is_archived- Channel has been archived.
not_in_channel- Authenticated user is not in the channel.
too_long- Topic was longer than 250 characters.
user_is_restricted- Setting the topic is a restricted action.