Uncrustify: where do the Spaces options work

# Uncrustify: Where do the options work?

## Spaces for operator

    {
       bool operator█()█(T1 const t1, T2 const t2)
       {
          ...
       }
       unc_text operator =█()
       {
          ...
       }
    }

# Register

sp_after_operator | Add or remove space between 'operator' and operator sign.
sp_after_operator_sym | Add or remove space between the operator symbol and the open paren, as in 'operator ++('.
sp_after_operator_sym_empty | Add or remove space between the operator symbol and the open paren when the operator has no arguments, as in 'operator *()'. Have precedence of sp_after_operator_sym.