update vertextColor description to note the range of the values
update vertextColor description to note the range of the values

etpinard/plotly.js,aburato/plotly.js,plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js