4.x Review and correct doc for using alternate ports for Helidon-provided services

[tjquinno]

Environment Details

• Helidon Version: 4.x
• Helidon SE or Helidon MP MP
• JDK version:
• OS:
• Docker version (if applicable):

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Problem Description

Doc error: https://helidon.io/docs/v4/mp/server#conf-additional-ports

The socket config seems OK but the change for metrics and health are incorrect.

For a correct set-up see the MP multiport example: https://github.com/helidon-io/helidon-examples/blob/helidon-4.x/examples/microprofile/multiport/src/main/resources/application.yaml

Steps to reproduce

In the MP QuickStart app follow the instructions in the first link above, except use "localhost" for the host so you can actually try it. Then build and start the server. Helidon continues to response at the default port 8080 for /metrics instead of the apparently-configured alternate port.