[doc] Add explanations for built-in actions

[wenjin272]

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Description

Currently, when demonstrating how to declare a Workflow, our examples define two actions:

1. Accept an InputEvent and send a ChatRequestEvent
2. Receive a ChatResponseEvent and send an OutputEvent

Users might wonder why there’s no need to explicitly define an action that processes the ChatRequestEvent and sends the ChatResponseEvent. This is because the framework provides a built-in chat action that handles this automatically. However, we currently have no explanation here, which may confuse users.

Are you willing to submit a PR?

• I'm willing to submit a PR!

[da-daken]

hi @wenjin272 , I'd like to participate in this work, but i have a question, Should I add a new action document under the docs/content/docs/development directory, or should I write it in another location?

[wenjin272]

Hi, @da-daken, thanks for you interest. My idea is to add supplementary content within the existing sections rather than creating new ones.

In Workflow Agent section, we actually mentioned built-in events and actions. I believe we can provide a brief explanation in the Workflow Agent Example subsection and reference that content.

In the Built-in Events and Actions subsection, We informed users to refer to the Chat Model and Tool Use sections for detailed information about built-in actions. However, in these sections, we did not introduce the related built-in actions, which is an area that needs to be supplemented.

[da-daken]

@wenjin272 Okay, I'll help you get this work done in the next few days