"about" parameter in metadata does not appear when alone

Here's an example of metadata I have for one database on datasette.

```
"Records-requests": {
	"tables": {
		"Some table": {
			"about": "This table has data."
		}
	}
}
```

The text in `about` does not show up when I publish the data. But it shows up after I add a `"source"` parameter in the metadata.

Is this intended?