[docs] [issue30337] Vague wording of pkgutil.walk_packages parameter 'prefix'

[Sam Silberstein]

Changes by Sam Silberstein <samuelmsilberstein at gmail.com>:


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components: +Library (Lib) -Documentation
versions:  -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30337>
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