[clang] [Clang] [Docs] Add release note for expansion statements (PR #208878)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Sirraide

<details>
<summary>Changes</summary>

This was supposed to be part of the original patch, but we lost it because I didn't pay enough attention when I was merging the release notes after the migration from RST -> MD (I deleted the RST file but forgot to move the release note to the MD file...)

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Full diff: https://github.com/llvm/llvm-project/pull/208878.diff


1 Files Affected:

- (modified) clang/docs/ReleaseNotes.md (+3) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.md b/clang/docs/ReleaseNotes.md
index 365d991b209a4..ed71115e3fa45 100644
--- a/clang/docs/ReleaseNotes.md
+++ b/clang/docs/ReleaseNotes.md
@@ -258,6 +258,9 @@ latest release, please see the [Clang Web Site](https://clang.llvm.org) or the
 
 - Clang now propagates `constinit` and `constexpr` in structured bindings with tuple-like initializers.
 
+- Clang now has partial support for [P1306R5](https://wg21.link/P1306R5) Expansion Statements. Iterating expansion
+  statements currently cannot be expanded and will result in a diagnostic, but other types of expansion statements work.
+
 #### C++23 Feature Support
 
 - Partially implement Itanium mangling for pack indexing. Partially substituted packs are not yet supported. (#GH112003)

``````````

</details>


https://github.com/llvm/llvm-project/pull/208878