[Request]: Fix APM API key creation command

[bmorelli25]

Description

https://www.elastic.co/guide/en/kibana/current/agent-key-api.html#apm-create-agent-key-privileges is incorrect.

@joeafari was able to successfully create a key with the following privs:

{
  "apm_agent_key_user": {
    "cluster": [
      "manage_own_api_key"
    ],
    "indices": [],
    "applications": [
      {
        "application": "kibana-.kibana",
        "privileges": [
          "feature_apm.all"
        ],
        "resources": [
          "*"
        ]
      },
      {
        "application": "apm",
        "privileges": [
          "event:write",
          "config_agent:read"
        ],
        "resources": [
          "*"
        ]
      }
    ],
    "run_as": [],
    "metadata": {},
    "transient_metadata": {
      "enabled": true
    }
  }
}

Resources

https://elastic.slack.com/archives/CJYH0RWR3/p1701780969214649

Which documentation set does this change impact?

Stateful only

Feature differences

n/a

What release is this request related to?

N/A

Collaboration model

The documentation team

Point of contact.

None