[llvm-branch-commits] [libcxx] [libc++][doc] Update the release notes for LLVM 19. (PR #100167)

[Konstantin Varlamov via llvm-branch-commits]

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@@ -151,10 +175,11 @@ Deprecations and Removals
 - libc++ no longer supports ``std::allocator<const T>`` and containers of ``const``-qualified element type, such
   as ``std::vector<const T>`` and ``std::list<const T>``. This used to be supported as an undocumented extension.
   If you were using ``std::vector<const T>``, replace it with ``std::vector<T>`` instead. The
-  ``_LIBCPP_ENABLE_REMOVED_ALLOCATOR_CONST`` macro can be defined to temporarily re-enable this extension as
-  folks transition their code. This macro will be honored for one released and ignored starting in LLVM 20.
+  ``_LIBCPP_ENABLE_REMOVED_ALLOCATOR_CONST`` macro can be defined to temporarily re-enable this extension.
+  to temporarily re-enable this extension to make it easier to update user code
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var-const wrote:

Note: the `temporarily re-enable` part seems to be duplicated.

https://github.com/llvm/llvm-project/pull/100167