[3.13] document that `sys._is_gil_enabled` is CPython-specific (GH-131748) (#131760)

document that `sys._is_gil_enabled` is CPython-specific (GH-131748)
(cherry picked from commit ac12de2e6a6f5c1da83de0412bb7d03c28fdab63)

Co-authored-by: Ralf Gommers <ralf.gommers@gmail.com>

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 68301b74d2f8b0238e491ae76a48af9f798562bb..c993d58378708d8eeb46e61abcc0ff44eb827159 100644 (file)
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -1235,6 +1235,9 @@ always available. Unless explicitly noted otherwise, all variables are read-only
 
    .. versionadded:: 3.13
 
+   .. impl-detail::
+
+      It is not guaranteed to exist in all implementations of Python.
 
 .. function:: is_finalizing()