[Doc] Specify in help that option arguments arg must be used with `=`
Example
help says:
--scalars <array_name> Color by scalars
But:
f3d --scalars "Density" multicomb_0.vts
Error parsing options: Option ‘positional’ does not exist
correct version is
f3d --scalars="Density" multicomb_0.vts
The =
sign should be added in the man.
Edited by Nicolas Vuaille