CPP: Change note.

Author: geoffw0

change-notes/1.21/analysis-cpp.md

@@ -17,5 +17,6 @@
 | Memory is never freed (`cpp/memory-never-freed`) | More correct results | Support added for more Microsoft-specific allocation functions, including `LocalAlloc`, `GlobalAlloc`, `HeapAlloc` and `CoTaskMemAlloc`. |
 | Resource not released in destructor (`cpp/resource-not-released-in-destructor`) | Fewer false positive results | Resource allocation and deallocation functions are now determined more accurately. |
 | Comparison result is always the same | Fewer false positive results | The range analysis library is now more conservative about floating point values being possibly `NaN` |
+| Wrong type of arguments to formatting function (`cpp/wrong-type-format-argument`) | More correct results and fewer false positive results | This query now more accurately identifies wide and non-wide string/character format arguments on different platforms.  Platform detection has also been made more accurate for the purposes of this query. |
 
 ## Changes to QL libraries