fix(discovery): fix docs related to discovery

[paologallinaharbur]

The docs related to autodiscovery had some issues:

• the syntax was wrong: ${'${discovery.ip}'}
• the integration example was a mix of Config format v3 and V4 (command: and name of integration not matching binary)

[github-actions]

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[akristen]

Hi @paologallinaharbur ! Please reach out to the docs hero when this PR is ready for a review and merge. Thanks!