[Jclouds Wiki] Update of "Enums" by ZackShoylev

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The "Enums" page has been changed by ZackShoylev:
https://wiki.apache.org/jclouds/Enums?action=diff&rev1=8&rev2=9

     DOWN("down"),
     BUILD("build"), 
     ERROR("error"),
+    /**
+     * Used by jclouds when the service returns an unknown value other than 
null.
+     */
     UNRECOGNIZED("unrecognized");
     
     private final String name;