Document how to use Tokens and YAML together

Issue information

From user: nojj

Related to !144 (merged)

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I have a model, that is not working anymore. the eca_token_load_entity action seems to be the problem:

 Activity_183hnnt:
    plugin: eca_token_load_entity
    label: 'Load node'
    configuration:
      token_name: mynode
      from: properties
      entity_type: node
      entity_id: ''
      revision_id: ''
      properties: 'field_sid: [orderdata:sid]'
      langcode: _interface
      latest_revision: 'no'
      unchanged: 'no'
      object: ''

the eca logfiles show following warning:

Type	eca
Date	Thursday, May 5, 2022 - 09:15
User	admin
Location	https://eca-test.ddev.site/admin/commerce/orders/90/payments/91/operation/receive
Referrer	https://eca-test.ddev.site/admin/commerce/orders/90/payments/91/operation/receive
Message	Access denied to noname (Activity_183hnnt) from ECA Payment publishes ordered node new without custom module (process_dnqpvqs) for event Drupal\state_machine\Event\WorkflowTransitionEvent.
Severity	Warning