Document the Workflow deprecations

[javiereguiluz]

symfony/symfony#24751:

• Deprecated the add method in favor of the addWorkflow method in Workflow\Registry.
• Deprecated SupportStrategyInterface in favor of WorkflowSupportStrategyInterface.
• Deprecated the class ClassInstanceSupportStrategy in favor of the class InstanceOfSupportStrategy.

@Simperfit do you think you could update the Workflow examples in the master branch of the docs to update for these deprecations? In addition to updating the example contents, we'd need to add cautions like this:

.. versionadded:: 4.1
    The ``addWorkflow()`` method was introduced in Symfony 4.1. In previous
    Symfony versions it was called ``add()``.

Thanks!

[Simperfit]

Yes, I'm going to do it tomorrow, could you please assign this issue to me ? @javiereguiluz

[javiereguiluz]

@Simperfit thanks! ... and sorry because GitHub doesn't let me assign it to you :(

[Simperfit]

@javiereguiluz this one can be close I think, there are no usage of SupportStrategyInterface or ClassInstanceSupportStrategy in the docs. but we need to take care of #7439

[javiereguiluz]

You are right. Closing then. Thanks!