[docs] [issue11379] Remove "lightweight" from minidom description

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

I'm attaching a patch for Doc/library/xml.dom.minidom.rst 

It adds the note as phrased by Stefan, with a tiny wording change to make the first sentence less ambiguous.

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keywords: +patch
Added file: http://bugs.python.org/file24686/issue_11379.1.patch

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