kernel-docs from home:patrikjakobsson:kernel-sle15-sp7 project

需要 pool ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:patrikjakobsson:kernel-sle15-sp7/pool/home:patrikjakobsson:kernel-sle15-sp7.repo
zypper refresh
zypper install kernel-docs