CPP: Change note.

Author: geoffw0

change-notes/1.21/analysis-cpp.md

@@ -11,5 +11,6 @@
 
 | **Query**                  | **Expected impact**    | **Change**                                                       |
 |----------------------------|------------------------|------------------------------------------------------------------|
+| Mismatching new/free or malloc/delete (`cpp/new-free-mismatch`) | Fewer false positive results | Fixed an issue where functions were being identified as allocation functions inappropriately.  Also affects `cpp/new-array-delete-mismatch` and `cpp/new-delete-array-mismatch`. |
 
 ## Changes to QL libraries