Update no-xfail-without-tracker.cpp

Author: lbushi25

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

@@ -55,5 +55,6 @@
 //
 // 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
+// add this line at the end of this file: // CHECK: Foo/foo.cpp 
+// or // CHECK-NEXT: Foo/foo.cpp in case the list is not empty.
 // Remove the CHECK once the test has been properly XFAIL-ed.