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* man/newusers.8.xml: Include documentation of SUB_GID_MIN, SUB_GID_MAX, SUB_GID_COUNT, SUB_UID_MIN, SUB_UID_MAX, SUB_UID_COUNT. * man/useradd.8.xml: Likewise. * man/usermod.8.xml: Likewise. * man/newusers.8.xml: Document usage of /etc/subgid /etc/subuid. * man/useradd.8.xml: Likewise. * man/userdel.8.xml: Likewise. * man/usermod.8.xml: Likewise. * man/newusers.8.xml: Add references to subgid(5) and subuid(5). * man/useradd.8.xml: Likewise. * man/userdel.8.xml: Likewise. * man/subgid.5.xml: Sort references alphabetically. * man/subuid.5.xml: Likewise. * man/subgid.5.xml: Add references to newusers(8), useradd(8), userdel(8), usermod(8), user_namespaces(7). * man/subuid.5.xml: Likewise.