`intersperse` documentation contains an error

[amn]

intersperse uses the *args syntax, meaning explanation of intersperse(('foo', 'bar', 'baz'), ...) as written in the docstring, is incorrect:

csspring/src/csspring/utils.py

Line 21 in 0ce47c5

E.g. `intersperse(("foo", "bar", "baz"), "-")` will yield "foo", "-", "bar", "-", then "baz".