Bug 30750

 I too like to avoid duplication, but I think the amount duplicated
 (about 15 words) is too small to eliminate, given the structure of the
 man page.  The information provided in the patch is stuff I've seen
 written in articles and posts; it should be available in documentation.
 
 I had hoped that the sketchiness of this (and many other man pages)
 was the result of a lack of time, not a desire for brevity.  I guess
 I'll learn the FreeBSD tradition after a while.
 
 BTW, the descriptions of /var/tmp and /tmp are misleading for even the
 FreeBSD default because the dirs are treated similarly (neither is
 cleaned at boot) but described differently.
 
 The Footnote idea is useful in any case; I'll add it to my to-do list
 for a separate PR.  How about adding it to the one line "Description"
 section instead of footnoting it?  Or in a "Bugs" section?  Man pages
 don't really have footnotes, do they?