Function render_function_section 

fn render_function_section(
    out: &mut String,
    span: Span,
    f: &ItemFunction<'_>,
    docs: &DocComments<'_>,
    ctx: &Ctx<'_>,
    name_to_page: &NameToPage,
    page_path: &Path,
    inherited: Option<&InheritedDoc>,
)