[Clang] Add release note for consistent structured binding shadow warnings

Author: ivanmurashko

clang/docs/ReleaseNotes.rst

@@ -308,6 +308,11 @@ Bug Fixes in This Version
 - Builtin elementwise operators now accept vector arguments that have different
   qualifiers on their elements. For example, vector of 4 ``const float`` values
   and vector of 4 ``float`` values. (#GH155405)
+- Fixed inconsistent shadow warnings for lambda capture of structured bindings.
+  Previously, ``[val = val]`` (regular parameter) produced no warnings with ``-Wshadow``
+  while ``[a = a]`` (where ``a`` is from ``auto [a, b] = std::make_pair(1, 2)``) 
+  incorrectly produced warnings. Both cases now consistently show no warnings with 
+  ``-Wshadow`` and show uncaptured-local warnings with ``-Wshadow-all``. (#GH68605)
 
 Bug Fixes to Compiler Builtins
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