intro.2 as errno.2: Update maximum hard link limit

MFC after: 1 week
Co-authored-by: brooks
Reviewed by: brooks, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1192

(cherry picked from commit 6dfbe695c3223822734dddc926415a3ba347b42c)
(cherry picked from commit 828e648b26ea1d3d77a63eea395bba56b5109f2d)
Approved-by: re (cperciva)