[Fedora-packaging] where is %{_docdir} defined ? and should use %{_defaultdocdir} or %{_docdir} and maybe we need update https://fedoraproject.org/wiki/Packaging_tricks#Installing_documentation:_2_paths

[Sérgio Basto]

Hello,
%{_docdir} is a very strange macro , why rpm -E doesn't know what is 
%{_docdir} but %{_defaultdocdir} knows ?  

    rpm -E "%{_docdir}"
    %{_docdir}
    rpm -E "%{_defaultdocdir}"
    /usr/share/doc 

So should I use %{_defaultdocdir} instead %{_docdir} ? and how 
%{_docdir} is set ? 

Another matter is this wiki page : 
https://fedoraproject.org/wiki/Packaging_tricks#Installing_documentation:...
is not in line with https://fedoraproject.org/wiki/Changes/UnversionedDocdirs , 
should I update wiki page and change %{name}-%{version} with just %{name} ?

Also https://fedoraproject.org/wiki/How_to_create_an_RPM_package 
"rm -rf $RPM_BUILD_ROOT" should be cleaned ? 

Best regards,
-- 
Sérgio M. B.