yggdrasil.conf path different for Ubuntu

[d47081]

The issue,

confuses new members because default config location for Ubuntu 20.04-22.04 is /etc/yggdrasil/yggdrasil.conf not /etc/yggdrasil.conf presented in the documentation

Have updated docs 56165fb

Just my old PR 242 has no sub-branches for each commit there and collect about 3 subjects in one..