Patch for /trunk/vocab/api.ttl to fix typos

```
This patch fixes some typos in the vocab document where the default formatters 
are specified.
```

Original issue reported on code.google.com by `ansell.p...@gmail.com` on 31 Aug 2012 at 12:30

Attachments:
- [api.ttl.patch](https://storage.googleapis.com/google-code-attachments/linked-data-api/issue-13/comment-0/api.ttl.patch)
