Explanation: clarify the useradd -d parameter as it does create directory HOME_DIR if it doesn't exit.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1677005
Changelog: [serge] minor tweak to the text
The content of the man pages however is dependent on compile flags. So the
pre-built ones might not fit your version of shadow. To build them yourself use
--enable-man. Furthermore the following build requirements will be needed: