update ld2420 documentation to include optional uart_id and ld2420_id configuration variables

[nkinnan]

Description:

update ld2420 documentation to include optional uart_id and ld2420_id configuration variables

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /index.rst when creating new documents for new components or cookbook.

[coderabbitai]

Walkthrough

The changes enhance the documentation for the ld2420 module by introducing two new optional configuration parameters: ld2420_id and uart_id. These parameters allow users to specify which ld2420 instance to use and define the UART interface for the module, respectively. The documentation updates clarify the optional nature and roles of these parameters across multiple platform sections, improving configurability without altering core functionality.

Changes

Files	Change Summary
components/sensor/ld2420.rst	Added ld2420_id and uart_id parameters to various platform sections (sensor, binary_sensor, text_sensor, number, button, select). Updated documentation to describe the new parameters.

Possibly related PRs

• [bl0942] Tidy up example #4242: The changes in this PR involve the removal of the uart_id reference in the bl0942 sensor documentation, which is directly related to the uart_id parameter introduced in the main PR for the ld2420 module.

Suggested labels

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Suggested reviewers

• jesserockz

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