Fixing query for failed rules

Fixing example query to get number for failed requests in 24 hours in default namespace.

Signed-off-by: nileshbhadana <nileshbhadana3@gmail.com>

content/en/docs/Monitoring Kyverno With Prometheus Metrics/policy-results-info.md

@@ -40,10 +40,10 @@ Counter - An only-increasing integer representing the number of results/executio
 ## Useful Queries
 
 * Tracking the total number of rules which failed in the 24 hours in "default" namespace grouped by their rule types (validate, mutate, generate):<br>
-`sum(increase(kyverno_policy_results_total{policy_namespace="default"}[24h])) by (rule_type)`
+`sum(increase(kyverno_policy_results_total{policy_namespace="default", rule_result="fail"}[24h])) by (rule_type)`
 
 * Tracking the per-minute rate of the number of rule executions triggered by incoming Pod requests over the cluster:<br>
 `rate(kyverno_policy_results_total{resource_kind="Pod", rule_execution_cause="admission_request"}[1m])*60`
 
 * Tracking the total number of policies over the cluster running as a part of background scans over the last 2 hours:<br>
-`count(increase(kyverno_policy_results_total{rule_execution_cause="background_scan"}[2h]) by (policy_name))`
+`count(increase(kyverno_policy_results_total{rule_execution_cause="background_scan"}[2h]) by (policy_name))`