Telegex.set_chat_sticker_set

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

set_chat_sticker_set(chat_id, sticker_set_name)

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Specs

set_chat_sticker_set(integer() | String.t(), String.t()) ::
  {:ok, boolean()} | {:error, Telegex.Model.errors()}

Use this method to set a new group sticker set for a supergroup. The bot must be an administrator in the chat for this to work and must have the appropriate admin rights. Use the field can_set_sticker_set optionally returned in getChat requests to check if the bot can use this method. Returns True on success.