[libc++][NFC] Add release note for constexpr std::string
NOKEYCHECK=True
GitOrigin-RevId: ec3d22cd3a5fc6dfc8182611737fae9f18d527bf
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 79ec4f5..91a735c 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -42,7 +42,9 @@
- Implemented P1165R1 (Make stateful allocator propagation more consistent for ``operator+(basic_string)``)
-- Implemented P0674R1 (Support arrays in make_shared and allocate_shared)
+- Implemented P0674R1 (Support arrays in ``make_shared`` and ``allocate_shared``)
+
+- Implemented P0980R1 (Making ``std::string`` constexpr)
- `pop_heap` now uses an algorithm known as "bottom-up heapsort" or
"heapsort with bounce" to reduce the number of comparisons, and rearranges