Flows.nodered.org description of fields is wrong

### Current Behavior

The description page lists the fields as "size" and "src" but in the node config are "size" and "url"


Dynamic Configuration says "You can override the src value defined in Node-RED by passing a msg.src value to the iframe."
In fact you use msg.src to override the "url" config field.

### Expected Behavior

Description should ideally match the actual values.

msg.url should override the url field (perhaps msg.src also for backwards compatibility)

### Steps To Reproduce

_No response_

### Environment

- Node-RED Dashboard 2.0 version:
- Node-RED version:
- Node.js version:
- Platform/OS:
- Browser:

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate