title: In R/plotly, how to change the tooltip number format?
body: <p>In R/plotly, how to change the tooltip format?
  As below image, the tooltip 'Sales' show '0.230', how to transfer it to '23.0%' . Thanks！</p>
  <pre><code>library(ggplot2)
  library(plotly)
  
  mydata &lt;- data.frame(
    category=LETTERS[1:5],
    sales=c(0.234,0.23,0.17,0.4,0.35)
  )
  
  p &lt;- ggplot(mydata,aes(x=category,y=sales))+
    geom_point()
  
  ggplotly(p,tooltip=c('y','x'))
  </code></pre>
  <p><a href="https://i.stack.imgur.com/XCQ1H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XCQ1H.png" alt="enter image description here" /></a></p>