STORM-3240 update health check documentation with behavior change
STORM-3240 update health check documentation with behavior change

hmcl/storm-apache,kishorvpatil/incubator-storm,hmcl/storm-apache,kishorvpatil/incubator-storm,hmcl/storm-apache,kishorvpatil/incubator-storm,hmcl/storm-apache,hmcl/storm-apache,hmcl/storm-apache,kishorvpatil/incubator-storm,kishorvpatil/incubator-storm,hmcl/storm-apache,kishorvpatil/incubator-storm,kishorvpatil/incubator-storm