Extract Short Description in Section Mode

By adding the character "s" after the level for the section render mode of the Display Table Macro, the short description should be rendered in front of the table. This is similar as specifying the extract-short-desc parameter provided by other macros.

The reason why this should be handled differently is that the extraction mode is only relevant for the section render mode.

As a side note: the extract-short-desc parameter also works for this macro, but is because of the reasons mentioned above not put as a parameter in the UI.