Bug#442077: more words for man page

[jidanni@jidanni.org]

Please perhaps add on the man page after

     -n      Redirects stdin from /dev/null (actually, prevents reading
             from stdin).  This must be used when ssh is run in the back-
             ground.  A common trick is to use this to run X11 programs
             on a remote machine.  For example, ssh -n shadows.cs.hut.fi
             emacs & will start an emacs on shadows.cs.hut.fi, and the
             X11 connection will be automatically forwarded over an
             encrypted channel.  The ssh program will be put in the back-
             ground.  (This does not work if ssh needs to ask for a pass-
             word or passphrase; see also the -f option.)

these words:

Must be used if ssh is called from within a shell here document, or
else the rest of the document will be consumed even though the remote
program ssh is running accepts no input.