Colorscale documentation typo

[jonmmease]

Originally reported in plotly/plotly.py#1657 by @jkaluzka. There is a missing ] character after the first element of the example colorscale description at

plotly.js/src/components/colorscale/attributes.js

Line 197 in adf9bee

' `[[0, \'rgb(0,0,255)\', [1, \'rgb(255,0,0)\']]`.',

[etpinard]

Good 👁️ Thanks!