For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:vliaskovitis:branches:kernel:erms-fsrm:kernel-default/pool/home:vliaskovitis:branches:kernel:erms-fsrm:kernel-default.repo
zypper refresh
zypper install kernel-docs
For ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:vliaskovitis:branches:kernel:erms-fsrm:kernel-default/ARM/home:vliaskovitis:branches:kernel:erms-fsrm:kernel-default.repo
zypper refresh
zypper install kernel-docs