docs are out of sync with types

### Describe the bug

In the discussion on #2215, it was decided that `rawBody` should be null (not an empty array) for requests that have no body, and `body` would be as well. This isn't reflected in the published or documented types.

### Reproduction

n/a

### Logs

```shell
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```


### System Info

```shell
n/a
```


### Severity

annoyance

### Additional Information

_No response_