Remove things specific to the old Macintosh, and spell "Mac OS X" consistently.
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index 9843ff6..74d5ee7 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -188,7 +188,7 @@
Change system call restart behaviour: if *flag* is :const:`False`, system calls
will be restarted when interrupted by signal *signalnum*, otherwise system calls will
- be interrupted. Returns nothing. Availability: Unix, Mac (see the man page
+ be interrupted. Returns nothing. Availability: Unix (see the man page
:manpage:`siginterrupt(3)` for further information).
Note that installing a signal handler with :func:`signal` will reset the restart