Function buscar_documentacao_texto 

pub async fn buscar_documentacao_texto(
    cliente: &Client,
    chave: &str,
    library_id: &str,
    query: Option<&str>,
) -> Result<String, ErroContext7>

Fetches documentation for library_id as raw plain text (markdown).

Uses type=txt. Returns the raw response body as a String. Returns Err(ErroContext7) on HTTP errors to enable retry in executar_com_retry.