Add note for ethernet_info

[gtjadsonsantos]

Description:

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#<esphome PR number goes here>

Checklist:

• [x] Branch: next is for changes and new documentation that will go public with the next ESPHome release. Fixes, changes and adjustments for the current release should be created against current.
• [x] Link added in /index.rst when creating new documents for new components or cookbook.

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[jesserockz]

As this is a feature matched with a PR in esphome/esphome, please target your PR to the next branch and rebase.

Thanks Jesse