httpx 0.24 documentation issue for netrc support

[alexprengere]

From the docs: https://www.python-httpx.org/advanced/#netrc-support

>>> auth = httpx.NetRCAuth()
>>> client = httpx.Client(auth=auth)

Using that snippet will yield the error:

>>> httpx.NetRCAuth()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: NetRCAuth.__init__() missing 1 required positional argument: 'file'

Using NetRCAuth(file=None) fixes the issue, and produces the expected behavior, but perhaps it should be made the default value (I can open a PR).

[tomchristie]

Using NetRCAuth(file=None) fixes the issue, and produces the expected behaviour, but perhaps it should be made the default value.

Oops, yes it's typed as Optional, and I'd agree None should be the default, in line with the docs.

I can open a PR.

If you'd like to do that please do go ahead yup.

[tomchristie]

Escalated to #2666

[alexprengere]

PR opened, thanks for your reactivity!