testInvalidationBug: Remove an outdated detail from comment.

processing_node -3 is not automatically used anymore, such failure would
nowadays be a processing_node of -2. So simplify this comment.
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passed ERP5.CodingStyleTest-Master

00:47:34

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00:26:21

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04:01:28

passed ERP5.UnitTest-Master.Medusa

01:44:41

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:58

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:11