clarify purpose of `slop` option in assets/click
clarify purpose of `slop` option in assets/click

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