Telegex.set_chat_description

You're seeing just the function set_chat_description, go back to Telegex module for more information.
Link to this function

set_chat_description(chat_id, optionals \\ [])

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Specs

set_chat_description(integer() | String.t(), [{:description, String.t()}]) ::
  {:ok, boolean()} | {:error, Telegex.Model.errors()}

Use this method to change the description of a group, a supergroup or a channel. The bot must be an administrator in the chat for this to work and must have the appropriate admin rights. Returns True on success.