C++: fix test annotations

Co-authored-by: Jonas Jensen <jbj@github.com>

Author: Robert Marsh

cpp/ql/test/library-tests/dataflow/taint-tests/vector.cpp

@@ -426,27 +426,27 @@ void test_vector_inserter(char *source_string) {
 		std::vector<std::string> out;
 		auto it = std::back_inserter(out);
 		*it++ = std::string(source_string);
-		sink(out); // tainted [NOT DETECTED]
+		sink(out); // tainted [NOT DETECTED by IR]
 	}
 
 	{
 		std::vector<int> out;
 		auto it = std::back_inserter(out);
 		*it++ = source();
-		sink(out); // tainted [NOT DETECTED]
+		sink(out); // tainted [NOT DETECTED by IR]
 	}
 
 	{
 		std::vector<std::string> out;
 		auto it = std::back_inserter(out);
 		*++it = std::string(source_string);
-		sink(out); // tainted [NOT DETECTED]
+		sink(out); // tainted [NOT DETECTED by IR]
 	}
 
 	{
 		std::vector<int> out;
 		auto it = std::back_inserter(out);
 		*++it = source();
-		sink(out); // tainted [NOT DETECTED]
+		sink(out); // tainted [NOT DETECTED by IR]
 	}
 }