Errno man page

[Ivan Voras]

I think the errno(i.e. intro(2)) page needs to be updated. There is some 
information that doesn't "feel" current:

- for EFBIG (#27) - I hope the limit is > 2.1E9 on ufs2 :)
- for EMFILE - is the limit on open files really 64 per process?

Maybe there are others, but I only spotted these.

(And of course, tuning(7) also has some historical figures)

-- 
Every sufficiently advanced magic is indistinguishable from technology
    - Arthur C Anticlarke