Review Matlab documentation (see #10389)

This PR reviews the Matlab developers page as describe in the ticket https://trac.openmicroscopy.org.uk/ome/ticket/10389.

It also serves as a placeholder to describe the changes added to OMERO.matlab source code:
- ROI functions: openmicroscopy/openmicroscopy#797
- object loading functions: openmicroscopy/openmicroscopy#817

:warning: Do not merge before 4.4.7