[BUG] - Docs example 'Non-Linear Slider and Updatemode' doesn't render correctly in Dash 2.1

[LiamConnors]

This Slider example: https://dash.plotly.com/dash-core-components/slider#non-linear-slider-and-updatemode has a functioning slider on the docs page.

Using Dash 2.1, and without any update to the example code, the slider no longer works.

I can't see any changes in the Slider's functioning that should cause this. step and marks are both provided.

[HammadTheOne]

Just wanted to note - this example works if the min prop is set for the slider. The marks are actually broken in the existing 2.0 example as well, although the slider works. I'm adding a change to the slider so that an undefined min and max are determined if marks are set, but I think we should still update the example anyways:

    dcc.Slider(
        id='slider-updatemode',
        marks={i: '{}'.format(10 ** i) for i in range(4)},
        min=0  # missing in current example
        max=3,
        value=2,
        step=0.01,
        updatemode='drag'
    ),