Update 01_dataframe.ipynb

[Shadimrad]

I was looking into this and I thought either I am not fully grasping the fn or this is wrong. Since it is using the file itself rather than the fn. so it should have been either for file in files: or then, later on, had used "fn" instead of "file", right?

Here's a link to the highlighted part: https://tutorial.dask.org/01_dataframe.html#:~:text=for%20fn%20in%20file%3A%0A%20%20%20%20df%20%3D%20pd.read_csv(os.path.join(%27data%27%2C%20%27nycflights%27%2C%20file))%0A%20%20%20%20maxes.append(df.DepDelay.max())

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[dask-bot]

Beep boop! Here is a Binder link where you can try out this change.

[Shadimrad]

@jrbourbeau Hi, I think the test "docs/readthedocs.org:dask-tutorial — Read the Docs build failed!" might be problematic since the other open issue is also failing this test.

[jacobtomlinson]

The RTD build is experimental right now and is failing, we can safely ignore it.