MaxRowsError better error message

I’ve been running into this error a decent bit and a nice QoL change would be to include the command to ignore it in the error message. I’d be happy to create a PR if that sounds good.

I’d change the message here https://github.com/altair-viz/altair/blob/d862ad494ecc0a5cff7e8b114df14e0796efa108/altair/utils/data.py#L61 to

MaxRowsError(
            "The number of rows in your dataset is greater "
            "than the maximum allowed ({}). "
            "For information on how to plot larger datasets "
            "in Altair, see the documentation or add 'alt.data_transformers.disable_max_rows()' to your code".format(max_rows)
        )

[jakevdp]

We could maybe say something like

To disable this error, set 'alt.data_transformers.disable_max_rows()' BUT BEWARE: doing so may result in crashing your browser session and corrupting your notebook if not done carefully; see https://altair-viz.github.io/user_guide/faq.html#maxrowserror-how-can-i-plot-large-datasets for details.

I just want to make certain users understand that disabling max rows can have unfortunate consequences.

[EntilZha]

I suppose I wasn’t aware of that, I thought it was mainly to limit the number of SVG elements, but I could certainly see where that could cause issues.