Clarify select.kqeueu and select.kevent can be used on macOS

Author: aisk

Doc/library/select.rst

@@ -100,8 +100,9 @@ The module defines the following:
 
 .. function:: kqueue()
 
-   (Only supported on BSD.)  Returns a kernel queue object; see section
-   :ref:`kqueue-objects` below for the methods supported by kqueue objects.
+   (Only supported on BSD and macOS.)  Returns a kernel queue object;
+   see section :ref:`kqueue-objects` below for the methods supported by
+   kqueue objects.
 
    The new file descriptor is :ref:`non-inheritable <fd_inheritance>`.
 
@@ -111,8 +112,9 @@ The module defines the following:
 
 .. function:: kevent(ident, filter=KQ_FILTER_READ, flags=KQ_EV_ADD, fflags=0, data=0, udata=0)
 
-   (Only supported on BSD.)  Returns a kernel event object; see section
-   :ref:`kevent-objects` below for the methods supported by kevent objects.
+   (Only supported on BSD and macOS.)  Returns a kernel event object;
+   see section :ref:`kevent-objects` below for the methods supported by
+   kevent objects.
 
 
 .. function:: select(rlist, wlist, xlist, timeout=None)