[docs] [issue25461] Unclear language (the word ineffective) in the documentation for os.walk

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> What is the status on this? From this discussion, it looks like @vstinner pushed changes to resolve this. Do we close this? If this still needs a patch, then one of the patches can be reviewed in a PR on GitHub.

It seems like os_walk_doc.patch and issue25461.patch have been written after I pushed my changes. Would you be interested to convert these patches into a proper PR?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25461>
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