rubygem-rdoc from home:M0ses:infra project
Sty agraw n unessmres nnek/m
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:M0ses:infra/openSUSE_Tumbleweed/home:M0ses:infra.repo zypper refresh zypper install rubygem-rdoc