Feedback on tool-description.md

Comments, suggestions and minor changes for the tool description document.
Hi, Tim. Thanks for the patch!

The JobOrder doesn't have an adapter field. Those are in the tool description document. The wording of "corresponding value from JobOrder for the adapter" was likely confusing. It refers to the input value.

For example, if you have

```json
{
  "inputs": {
    "type": "object",
    "properties": {
      "int1": {"type": "integer"}
    }
}
```

and the job order

```json
{
  "inputs": {
    "int1": 3
  }
}
```

... the "corresponding value in JobOrder for int1 is 3.