bpo-20806: Reference both times(2) and times(3) and link to MSDN. (GH-15479)

Doc/library/os.rst

@@ -3879,7 +3879,9 @@ written in Python, such as a mail server's external command delivery program.
    :attr:`children_system`, and :attr:`elapsed` in that order.
 
    See the Unix manual page
-   :manpage:`times(2)` or the corresponding Windows Platform API documentation.
+   :manpage:`times(2)` and :manpage:`times(3)` manual page on Unix or `the GetProcessTimes MSDN
+   <https://docs.microsoft.com/windows/win32/api/processthreadsapi/nf-processthreadsapi-getprocesstimes>`
+   _ on Windows.
    On Windows, only :attr:`user` and :attr:`system` are known; the other
    attributes are zero.