[libc++] Mark __cpp_lib_constexpr_memory as being implemented
GitOrigin-RevId: 5d0d465ad4d25398519b85879d61fc126abd641c
diff --git a/docs/FeatureTestMacroTable.rst b/docs/FeatureTestMacroTable.rst
index 7028ff0..997d213 100644
--- a/docs/FeatureTestMacroTable.rst
+++ b/docs/FeatureTestMacroTable.rst
@@ -210,7 +210,7 @@
------------------------------------------------- -----------------
``__cpp_lib_constexpr_iterator`` *unimplemented*
------------------------------------------------- -----------------
- ``__cpp_lib_constexpr_memory`` *unimplemented*
+ ``__cpp_lib_constexpr_memory`` ``201811L``
------------------------------------------------- -----------------
``__cpp_lib_constexpr_numeric`` ``201911L``
------------------------------------------------- -----------------