Uncrustify: where do the Spaces options work

# Uncrustify: Where do the options work?

## Spaces for byref

       bool█&█foo(int█&█idx);

       MyType█&█MyClass::myMethode() {
          const MyType& t = getSomewhere();

# Register

sp_before_byref | Add or remove space before a reference sign '&'
sp_before_unnamed_byref | Add or remove space before a reference sign '&' that isn't followed by a variable name. If set to 'ignore', sp_before_byref is used instead.
sp_after_byref | Add or remove space after reference sign '&', if followed by a word.
sp_after_byref_func | Add or remove space after a reference sign '&', if followed by a func proto/def.
sp_before_byref_func | Add or remove space before a reference sign '&', if followed by a func proto/def.