grantpt and ptsname man pages

Hi,

near as i can tell (from tests and code), ptsname and grantpt both
require the passed-in fd to exist in /dev/pts.  So if you pass in
an fd from a newinstance devpts mounted elsewhere things can go
wrong.  Particularly if the passed-in fd is for /other/dev/pts/0
and /dev/pts/0 does not exist, then grantpt and ptsname will return
-ENOENT.

The manpage should probably mention that.  I've not written anything
for it yet.  (Willing to, but not until this weekend I'm afraid.)

thanks,
-serge
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