Update class qldoc

Co-authored-by: Mauro Baluda <mbaluda@github.com>

Author: MichaelRFairhurst

cpp/misra/src/rules/RULE-15-1-4/NonStaticMemberNotInitBeforeUse.ql

@@ -34,6 +34,14 @@ private predicate needsInitialization(Type t) {
 
 /**
  * An aggregate must be validated at construction time if it has a field that needs initialization.
+/**
+ * An aggregate that must be validated at construction time. 
+ * For example, `Agg` must be validated at construction time as it includes field `f1` that needs initialization.
+ * ```
+ * struct Agg {
+ *   int f1;
+ * };
+ * ```
  */
 class RelevantAggregate extends Class {
   CheckedField f;