Function render_free_functions 

fn render_free_functions(
    name: &str,
    overloads: &[(Span, &ItemFunction<'_>, &DocComments<'_>)],
    ctx: &Ctx<'_>,
    name_to_page: &NameToPage,
    page_path: &Path,
    git_url: Option<&str>,
) -> String