Using the `function` argument of `itertools.accumulate()` gets error against the doc

Bug report

Bug description:

The doc of itertools.accumulate() says the 2nd parameter is function as shown below:

itertools.accumulate(iterable[, function, *, initial=None])

But using function argument gets the error against the doc as shown below:

from itertools import accumulate
from operator import mul
                                            # ↓↓↓↓↓↓↓↓
for x in accumulate(iterable=[1, 2, 3, 4, 5], function=mul):
    print(x)
# TypeError: 'function' is an invalid keyword argument for accumulate()

So, I used func argument, then it works as shown below:

from itertools import accumulate
from operator import mul
                                            # ↓↓↓↓
for x in accumulate(iterable=[1, 2, 3, 4, 5], func=mul):
    print(x)
# 1
# 2
# 6
# 24
# 120

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• gh-135283

Start with the itertools.accumulate() documentation linked in the issue and compare its signature with the accepted keyword shown in the Python examples. Confirm the documented parameter name and update the documentation so the signature matches actual usage; check the linked PR gh-135283 before starting.