[docs] [issue30538] Functional Programming HOWTO describes one argument itertools.count()

[Raymond Hettinger]

Raymond Hettinger added the comment:

> Is it code churn to replace the old style string formatting
> or is that something else that should be done as clean-up?

Let's leave it as is.  Old-style formatting is still valid and is not going away.   We consciously decided not to sweep through the docs change the string formatting style.  Also, since both occur quite a bit in the wild, it is is useful for the docs to show some of both.

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