Fix comment stating incorrect assigned variable (#1342)

CppCoreGuidelines.md

@@ -10374,7 +10374,7 @@ Reuse of a member name as a local variable can also be a problem:
         if (x) {
             int m = 9;
             // ...
-            m = 99; // assign to member
+            m = 99; // assign to local variable
             // ...
         }
     }