docs/ctty.htm: add a useful URL to

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-10-21 18:44:33 +02:00 · 2011-10-21 18:44:33 +02:00 · 17fb598dc2
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 <p>Before looking at the Linux implementation, first a general Unix
 description of threads, processes, process groups and sessions.
+</p><p>
+(See also <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap11.html">General Terminal Interface</a>)
 </p><p>A session contains a number of process groups, and a process group
 contains a number of processes, and a process contains a number
 of threads.