docs: remove beacon node command prefix from --monitoring flags (#5879)

docs/usage/client-monitoring.md

@@ -9,14 +9,14 @@ and in your [account settings](https://beaconcha.in/user/settings#app).
 
 ## Configuration
 
-Lodestar provides CLI options to configure monitoring on both the beacon node and validator client.
+Lodestar provides CLI options to configure monitoring on both the beacon node **and** validator client.
 
 ### Remote endpoint URL
 
 Client monitoring can be enabled by setting the `--monitoring.endpoint` flag to a remote service endpoint URL.
 
 ```bash
-lodestar beacon --monitoring.endpoint "https://beaconcha.in/api/v1/client/metrics?apikey={apikey}&machine={machineName}"
+--monitoring.endpoint "https://beaconcha.in/api/v1/client/metrics?apikey={apikey}&machine={machineName}"
 ```
 
 In case of _beaconcha.in_, the API key can be found in your [account settings](https://beaconcha.in/user/settings#api).
@@ -44,7 +44,7 @@ It takes an integer value in milliseconds, the default is `60000` which means da
 For example, setting an interval of `300000` would mean the data is only sent every 5 minutes.
 
 ```bash
-lodestar beacon --monitoring.interval 300000
+--monitoring.interval 300000
 ```
 
 Increasing the monitoring interval can be useful if you are running into rate limit errors when posting large amounts of data for multiple nodes.