Document r267113, newsyslog.conf(5) includes in conf.d.

Sponsored by:	The FreeBSD Foundation
MFC r266915: MFV 266913+266914:

3897 zfs filesystem and snapshot limits (fix leak)
4901 zfs filesystem/snapshot limit leaks
MFC r266903: Update default callchain depth to 16 to match kernel
MFC r266880:
  Use g_conf_printf_escaped() to escape symbols, which can break
  an XML tree.
MFC r264417: realpath(): Properly fail "." or ".." components after
non-directories.

If realpath() is called on pathnames like "/dev/null/." or "/dev/null/..",
it should fail with [ENOTDIR]. Pathnames like "/dev/null/" already failed as
they should.

Also, put the check for non-directories after lstatting the previous
component instead of when the empty component (consecutive or trailing
slashes) is detected, saving an lstat() call and some lines of code.

PR:		82980
Merge remote-tracking branch 'freebsd/stable/10' into freebsd10