Move ReleaseNotes to Implemented papers

Author: vinay-deshmukh

libcxx/docs/ReleaseNotes/22.rst

@@ -41,6 +41,7 @@ Implemented Papers
 - P2321R2: ``zip`` (`Github <https://llvm.org/PR105169>`__) (The paper is partially implemented. ``zip_transform_view``
   is implemented in this release)
 - P3168R2: Give ``std::optional`` Range Support (`Github <https://llvm.org/PR105430>`__)
+- P3372R3: ``constexpr map``(`Github <https://llvm.org/PR134330>`__) (The paper is partially implemented. ``constexpr map`` is implemented in this release)
 
 Improvements and New Features
 -----------------------------
@@ -59,7 +60,6 @@ Improvements and New Features
   by up to 2.5x
 - The performance of ``map::insert_or_assign`` has been improved by up to 2x
 - ``ofstream::write`` has been optimized to pass through large strings to system calls directly instead of copying them
-- P3372R3: ``constexpr map``(`Github <https://github.com/llvm/llvm-project/issues/128660>`__) (The paper is partially implemented. ``constexpr map`` is implemented in this release)
   in chunks into a buffer.
 - Multiple internal types have been refactored to use ``[[no_unique_address]]``, resulting in faster compile times and
   reduced debug information.