gegl-doc from GNOME:STABLE:45 project
Select Your Operating System
Add repository and install manually
For SLE 15 SP6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:STABLE:45/SLE_15_SP6/GNOME:STABLE:45.repo zypper refresh zypper install gegl-doc