bpo-43475:  Fix worst case collision behavior for NaN instances (GH-25493)

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index e431d1b..fe1cca1 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -855,7 +855,7 @@
    +---------------------+--------------------------------------------------+
    | :const:`inf`        | hash value returned for a positive infinity      |
    +---------------------+--------------------------------------------------+
-   | :const:`nan`        | hash value returned for a nan                    |
+   | :const:`nan`        | (this attribute is no longer used)               |
    +---------------------+--------------------------------------------------+
    | :const:`imag`       | multiplier used for the imaginary part of a      |
    |                     | complex number                                   |