[Libreoffice] License statement

[Julien Chaffraix]

> Did you mean LGPLv3/MPL ?

Yes, that was a typo. Corrected line below:

All current and past contributions made to the LibreOffice project are
done under the LGPLv3 / MPL or later version of these licenses.
Until further notice, all future contributions to the LibreOffice
project are available under the LGPLv3 / MPL or later version of these
licenses.

Thanks,
Julien