Document latest OMERO.matlab functions

Fixes notably https://trac.openmicroscopy.org.uk/ome/ticket/11681

This PR adds documentation for recent additions to the OMERO.matlab:
- add a table for the annotations functions at the beginning of the annotation section
- add small description for the `write*Annotation` and `linkAnnotation` functions
- add small description for the `uploadFileAnnotation` replacement function
- fix `CreateImage` and `RenderImages` examples at the bottom by linking to the Training examples
- add small paragraph about `toByteArray` function