Point @@isConcatSpreadable test failure line at the correct bug

BUG=v8:4317
LOG=n
TBR=littledan@chromium.org

Review URL: https://codereview.chromium.org/1285983004 .

Cr-Commit-Position: refs/heads/master@{#30207}

test/test262-es6/test262-es6.status

@@ -542,7 +542,7 @@
   'language/expressions/object/method-definition/generator-name-prop-symbol': [FAIL],
   'language/expressions/object/method-definition/name-name-prop-symbol': [FAIL],
 
-  # https://code.google.com/p/v8/issues/detail?id=4289
+  # https://code.google.com/p/v8/issues/detail?id=4317
   'built-ins/Array/prototype/concat/is-concat-spreadable-val-falsey': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=2952