update non-working code example to use curried analogs

[circld]

Fix a broken example (or at the very least, make it clearer that curried analogs must be used) from the streaming analytics docs.

[eriknw]

Cool, it makes sense to be explicit about what functions are curried, and using curried directly is probably good practice. I would write the import as from toolz import curried though. Previously, I think from toolz.curried import * was implied.

Thanks @circld for careful reading and taking the initiative to make this update!

[eriknw]

Closing, because I think this was sufficiently covered in #435.

Thanks again @circld for carefully reading the docs and making a PR! (and sorry for my excessive delay)

[circld]

all good, thanks for the awesome module 👍