CPP: Change note.

Author: geoffw0

change-notes/1.20/analysis-cpp.md

@@ -14,6 +14,7 @@
 
 | **Query**                  | **Expected impact**    | **Change**                                                       |
 |----------------------------|------------------------|------------------------------------------------------------------|
+| Array argument size mismatch | Fewer false positives | An exception has been added to this query for variable sized arrays. |
 | Suspicious add with sizeof (`cpp/suspicious-add-sizeof`) | Fewer false positives | Pointer arithmetic on `char * const` expressions (and other variations of `char *`) are now correctly excluded from the results. |
 | Suspicious pointer scaling (`cpp/suspicious-pointer-scaling`) | Fewer false positives | False positives involving types that are not uniquely named in the snapshot have been fixed. |
 | Lossy function result cast (`cpp/lossy-function-result-cast`) | Fewer false positive results | The whitelist of rounding functions built into this query has been expanded. |