Update visualization.rst
closes #26293

Note added to the docs, warning users to be careful when adapting datetime indices generated by pandas.
@TomAugspurger any thoughts on this?  What does this add to the paragraph starting with "In some situations it
may still be preferable or necessary to prepare plots"?

They both seem to be about using Matplotlib directly rather than
DataFrame.plot.

On Mon, Aug 26, 2019 at 1:08 PM William Ayd <notifications@github.com>
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 I agree with Jeff and Tom, the note in this PR is just repeating what it's already in the docs. Closing this, and since the issue is still open, if someone has a better idea on how to help the users understand the problem with ticks, can open a new PR.