Add values to rrd-status docs

[mmahacek]

Based on values per

opennms/opennms-services/src/main/java/org/opennms/netmgt/poller/pollables/StatusStoringServiceMonitorAdaptor.java

Lines 119 to 125 in de93eea

	private static double buildPollStatusValue(final PollStatus status) {
	switch (status.getStatusCode()) {
	case PollStatus.SERVICE_AVAILABLE: return 1.0;
	case PollStatus.SERVICE_UNAVAILABLE: return 0.0;
	case PollStatus.SERVICE_UNRESPONSIVE: return -1.0;
	case PollStatus.SERVICE_UNKNOWN: return Double.NaN;
	default: throw new IllegalStateException("Unhandled status code");

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[dino2gnt]

This is good, high quality documentatin'.

[Bonrob2]

LGTM and I won't argue with Dino. Thanks!