C++: Add change note.

MathiasVP · MathiasVP · commit bd1720f79744 · 2022-01-20T18:27:09.000Z
diff --git a/cpp/ql/src/change-notes/2022-01-20-return-stack-allocated-memory.md b/cpp/ql/src/change-notes/2022-01-20-return-stack-allocated-memory.md
@@ -0,0 +1,5 @@
+---
+category: minorAnalysis
+---
+* The `cpp/return-stack-allocated-memory` query has been improved to produce fewer false positives. The
+  query has also been converted to a `path-problem` query.
