remote_receiver: document using multiple with receiver_id

[azrdev]

Description:

Having multiple remote_receiver requires them to being a list, otherwise they're silently merged.
When using them in binary_sensor, receiver_id is undocumented so far, but omitting it fails to compile with the error

binary_sensor.remote_receiver: [source IR_receiver.yml:59]

  Too many candidates found for 'receiver_id' type 'remote_base::RemoteReceiverBase' Some are 'F1000a_rx', 'TSOP31238'.

Related issue (if applicable): none

Pull request in esphome with YAML changes (if applicable): none

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.

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