Core-AAM: update UIA mapping for describedby (#42784)

diff --git a/core-aam/aria-describedby-manual.html b/core-aam/aria-describedby-manual.html
index 696c30a..8efd891 100644
--- a/core-aam/aria-describedby-manual.html
+++ b/core-aam/aria-describedby-manual.html
@@ -58,12 +58,6 @@
                   "FullDescription",
                   "is",
                   "hello world"
-               ],
-               [
-                  "property",
-                  "DescribedBy",
-                  "is",
-                  "[description]"
                ]
             ]
          },