[docs] [issue20237] Ambiguous sentence in document of xml package.

[A.M. Kuchling]

A.M. Kuchling added the comment:

I applied Fran Bull's change; thanks for the patch!

The vulnerabilities section had several grammar issues, so I made an editing pass over it and made various other changes in my commit.

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nosy: +akuchling
stage:  -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue20237>
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