Introduce basic parts of a workflow in this markdown?

[vortexing]

https://github.com/openwdl/wdl-docs/blob/main/docs/WDL/workflow.md

I think this is too simple, which is strange to say. I feel like the section where this gets read would need to introduce the basic parts of a workflow instead of something this minimal:

Workflow:

• inputs
• calls
• outputs

Nothing much fancier than that, but it seems almost not useful for a newb b/c it doesn't say enough!