Mark up one missed None in pkgutil.rst (#8851)
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@ -77,8 +77,8 @@ support.
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newly created by a path hook.
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If there is no importer, a wrapper around the basic import machinery is
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returned. This wrapper is never inserted into the importer cache (None is
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inserted instead).
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returned. This wrapper is never inserted into the importer cache (``None``
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is inserted instead).
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The cache (or part of it) can be cleared manually if a rescan of
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:data:`sys.path_hooks` is necessary.
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