Docs: Link os.chdir to context manager contextlib.chdir

Author: cmaloney

Doc/library/os.rst

@@ -2180,6 +2180,11 @@ features:
 
    .. audit-event:: os.chdir path os.chdir
 
+   .. seealso::
+
+      Context manager :func:`contextlib.chdir`
+         Changes the working directory and restores the previous one on exit.
+
    .. versionchanged:: 3.3
       Added support for specifying *path* as a file descriptor
       on some platforms.