C#: Add change note.

michaelnebel · michaelnebel · commit 469b289db9d2 · 2023-02-14T13:14:45.000+01:00
diff --git a/csharp/ql/lib/change-notes/2023-02-14-checked-operators.md b/csharp/ql/lib/change-notes/2023-02-14-checked-operators.md
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+---
+category: minorAnalysis
+---
+* C# 11: Added library support for `checked` operators.

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 +---
 +category: minorAnalysis
 +---
 +* C# 11: Added library support for `checked` operators.