Fix formatting of Neural network post-filter characteristics SEI parameter table

Parameter names are longer than in any other section. This caused the table
to be extended beyond the right page border.

A new table type was introduced which reduces the width of the right table i
column.

Additionally the following fixes are included:

- fix typo that prevented compilation
- remove unnecessary tabular formatting inside descriptions (including not properly matched one)
- reduce column with in sub-tables to match new column width