minor tweaks

#' @title Draw Doughnut

#' @title Draw doughnut plot

#' @description These functions create and draw doughnut.

#' @param x,y a numeric value or unit object.

#' @param r0,r1 a non-negtive numeric value.

% Generated by roxygen2: do not edit by hand

% Please edit documentation in R/Doughnut-grob.R

% Please edit documentation in R/doughnut-grob.R

\name{DoughnutGrob}

\alias{DoughnutGrob}

\alias{grid.doughnut}

\title{Draw Doughnut}

\title{Draw doughnut plot}

\usage{

DoughnutGrob(

  x = 0.5,