Update docstrings in plots.js.
Update docstrings in plots.js.

richford/AFQ-Browser,richford/AFQ-Browser,yeatmanlab/AFQ-viz,yeatmanlab/AFQ-Browser,arokem/AFQ-Browser,richford/AFQ-viz,yeatmanlab/AFQ-Browser,richford/AFQ-viz,yeatmanlab/AFQ-Browser,richford/AFQ-Browser,yeatmanlab/AFQ-viz,arokem/AFQ-Browser,arokem/AFQ-Browser