C#: Add change note.

michaelnebel · michaelnebel · commit 115a0a4318de · 2023-01-30T14:28:35.000+01:00
diff --git a/csharp/ql/lib/change-notes/2023-01-26-reffields.md b/csharp/ql/lib/change-notes/2023-01-26-reffields.md
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+---
+category: minorAnalysis
+---
+* C# 11: Added extractor support for `ref` fields in `ref struct` declarations.

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 +---
 +category: minorAnalysis
 +---
 +* C# 11: Added extractor support for `ref` fields in `ref struct` declarations.