availability only works for platforms :(

Author: Eclips4

Doc/library/sys.rst

@@ -1239,7 +1239,7 @@ always available.
    Return :const:`True` if :ref:`JIT compiler <whatsnew313-jit-compiler>` is active.
    Return :const:`False` otherwise.
 
-   .. availability:: JIT builds, tier 2 interpreter doesn't count here.
+   Available only in JIT builds, tier 2 interpreter doesn't count here.
 
    .. versionadded:: next