For example, urlsplit:

>>> from urllib.parse import urlsplit
>>> help(urlsplit)
Help on function urlsplit in module urllib.parse:

urlsplit(url, scheme='', allow_fragments=True)
    Parse a URL into 5 components:
    <scheme>://<netloc>/<path>?<query>#<fragment>
    Return a 5-tuple: (scheme, netloc, path, query, fragment).
    Note that we don't break the components up in smaller bits
    (e.g. netloc is a single string) and we don't expand % escapes.


The current docstring does not describe the `scheme` or `allow_fragments` arguments.  Also, the note about not splitting netloc is misleading; the components of netloc (username, password, hostname, and port) are available as extra attributes of the returned SplitResult.

urlparse has similar issues; other functions could stand to be checked.