Math Guide and Ch9 Getting started with Math

Hello,

I propose updates of Math Guide and chapter 9 of Getting started with Math.
I uploaded them on the wiki
https://wiki.documentfoundation.org/Documentation/Development
If I did not put them at the right place, please let know where I can upload
them.

There was no noticeable new features in LibO3.6, except Help buttons in some
dialogs. So, no update is required for 3.6.

Have a warm day.

Laurent BP

Hi,

Small update of both documents today.

Laurent BP

Thanks, Laurent. I've taken copies and will look at them ASAP.
--Jean