remove metrics server leader election env vars (#1434)

Signed-off-by: lanting.chiang <[email protected]>

content/docs/2.15/operate/cluster.md

@@ -158,7 +158,7 @@ To modify this properties you can set environment variables on both KEDA Operato
 
 ## Configure Leader Election
 
-Like reconciliation, KEDA also uses the [controller-runtime project](https://github.com/kubernetes-sigs/controller-runtime) for electing the leader replica. The following properties can be configured for either the Operator and Metrics Server Deployment:
+Like reconciliation, KEDA Operator also uses the [controller-runtime project](https://github.com/kubernetes-sigs/controller-runtime) for electing the leader replica. The following properties can be configured for the Operator Deployment:
 
 - [`LeaseDuration`](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/manager#Options.LeaseDuration)
 - [`RenewDeadline`](https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/manager#Options.RenewDeadline)
@@ -171,9 +171,6 @@ To specify values other than their defaults, you can set the following environme
 | KEDA_OPERATOR_LEADER_ELECTION_LEASE_DURATION | Operator       | 15s           | LeaseDuration    |
 | KEDA_OPERATOR_LEADER_ELECTION_RENEW_DEADLINE | Operator       | 10s           | RenewDeadline    |
 | KEDA_OPERATOR_LEADER_ELECTION_RETRY_PERIOD   | Operator       | 2s            | RetryPeriod      |
-| KEDA_METRICS_LEADER_ELECTION_LEASE_DURATION  | Metrics Server | 15s           | LeaseDuration    |
-| KEDA_METRICS_LEADER_ELECTION_RENEW_DEADLINE  | Metrics Server | 10s           | RenewDeadline    |
-| KEDA_METRICS_LEADER_ELECTION_RETRY_PERIOD    | Metrics Server | 2s            | RetryPeriod      |
 
 ## Restrict the Namespaces KEDA is Watching