Handle Word files generated by Microsoft Word Online.

For some reason, Word in Office 365 Online uses `document2.xml`
for the content, instead of `document.xml`.  This causes pandoc
not to be able to parse docx.

This quick fix has the parser check for both `document.xml`
and `document2.xml`.

Addresses #5277, but a more robust solution would be to
get the name of the main document dynamically (who knows
whether it might change again?).

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