Update cpp/ql/test/library-tests/controlflow/dereferenced/dereferenced.cpp

Co-authored-by: Mathias Vorreiter Pedersen <mathiasvp@github.com>

Author: geoffw0

cpp/ql/test/library-tests/controlflow/dereferenced/dereferenced.cpp

@@ -16,7 +16,7 @@ void test1(int *ptr, int &ref)
 	ptr[0] = 0; // `ptr` dereferenced
 	ptr = 0;
 
-	(*ptr)++; // `ptr` dereferenced
+	(*ptr)++; // `ptr`, `*ptr` dereferenced
 	*(ptr++); // `ptr++` dereferenced
 	ptr++;