C++: Improve change note comments.

Author: MathiasVP

cpp/ql/src/change-notes/2024-04-09-reduce-FP.md

@@ -1,6 +1,5 @@
 ---
-category: majorAnalysis
+category: minorAnalysis
 ---
-* Reduce false positives of `GlobalUseBeforeInit.ql` and `InconsistentNullnessTesting.ql`.
-Many global variables that are initialized at declaration will be reported by `GlobalUseBeforeInit.ql`.
-When `checked` is in a macro expansion for handling exceptions, it is very likely for `InconsistentNullnessTesting.ql` to report false positives.
+* The "Global variable may be used before initialization" query (`cpp/global-use-before-init`) no longer raises an alert on global variables that are initialized when they are declared.
+* The "Inconsistent null check of pointer" query (`cpp/inconsistent-nullness-testing`) query no longer raises an alert when the guarded check is in a macro expansion.