Clarify xfail on 3.14 (#1453)

fixes #1431

Author: hynek

tests/test_slots.py

@@ -772,11 +772,13 @@ def f(self) -> int:
 
 
 @pytest.mark.xfail(
-    PY_3_14_PLUS, reason="3.14 returns weird annotation for cached_properies"
+    PY_3_14_PLUS, reason="3.14 does not infer the type anymore."
 )
 def test_slots_cached_property_infers_type():
     """
-    Infers type of cached property.
+    Infers type of cached property on Python 3.13 and earlier.
+
+    See also #1431.
     """
 
     @attrs.frozen(slots=True)