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

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

+1 to the suggested wording.

-1 to talking about a more pythonic API.

(Want a nit?  s/W3C-DOM/W3C DOM/)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11379>
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