Update no-xfail-without-tracker.cpp

Author: lbushi25

sycl/test/e2e_test_requirements/no-xfail-without-tracker.cpp

@@ -56,3 +56,4 @@
 // List of improperly XFAIL-ed tests.
 // As an example, if test test-e2e/Foo/foo.cpp is improperly XFAIL-ed, 
 // add this line at the end of this file: // CHECK: Foo/foo.cpp
+// Remove the CHECK once the test has been properly XFAIL-ed.