fix typo in colorscale attr description
fix typo in colorscale attr description

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