* Revert "Revert "Add device based MQTT auto discovery (#31122)" (#33059)"
This reverts commit ba80f8b73ac22fbfdb328cfd6cdad475e7aa187e.
* Document `migrate_discovery` option
* Add note that unique_id is required for device based discovery
* Rework docs for different use of migrate_discovery option flag
* Follow up from code-review
* Re-using discovery_id is no longer required
* Follow up on review
* more follow up
* More corrections
* Add column
* typo
* Remove duplicate header
* Clearify json example
* changed abbreviation `cmps` and added abbreviation `p`
* Update source/_integrations/mqtt.markdown
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
* More follow up actions
* Fix back ticks
* Remove redundant header and redundant origing documentation
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Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>