On Leap 42.1 & SLES 12.x, there is no man page for shadow(5) [describing the
format of the /etc/shadow file].  Previous releases (e.g. openSUSE 12.3, SLES
11) shipped it in the man-pages package:
$ rpm -qf /usr/share/man/man5/shadow.5.gz
man-pages-3.46-1.1.1.noarch

but it is no more.  I believe it was part of man-pages-addons.tar.bz2, which
was removed in man-pages 3.66: https://build.opensuse.org/request/show/233560

The shadow package, where it might be expected to be, is explicitly deleting it
(among other things) during %install:
https://build.opensuse.org/package/view_file/openSUSE:Factory/shadow/shadow.spec
(line 174-75 as of this writing)

Probably we should take the man page from the shadow package (and not delete it
during build)?  This may not be the only missing man page -- anything formerly
in man-pages-addons or that's being deleted in shadow's %install should be
double-checked -- but it's the only one I've personally noticed.