This is going to be hard to read bunched together like this. Would you mind breaking things up with some blank lines?

Also, using [@rdodev's curl samples](https://github.com/rackerlabs/developer.rackspace.com/blob/master/src/docs/queues/samples/authentication.rst) as a guide for consistency:

 * He doesn't use the `$` placeholder prompt. I'd favor not including it too, because it hinders the ability to copy and paste directly into shell scripts.
 * We've been using `${ALL_CAPS}` for environment variables and `{camelCase}` for placeholders, to better distinguish the two. (Environment variables are assigned somewhere previously within the guide; placeholders are account information or other external information.)
 * Is it necessary to extract publicURL as a variable, if it's only used once?

Here's this section as an example:

```bash
# To authenticate, use your Rackspace Cloud Account user name and API key:
curl -s https://identity.api.rackspacecloud.com/v2.0/tokens -X POST \
       -d '{"auth":{"RAX-KSKEY:apiKeyCredentials":{"username":"{username}", "apiKey":"{apiKey}"}}}' \
       -H "Content-Type: application/json" | python -m json.tool

# NOTE: {username} and {apiKey} are placeholders. Replace them with actual values and do not enclose the
# values with {}.

# Export your PUBLIC_URL and TOKEN from the json response.
export PUBLIC_URL="{publicUrl}"
export TOKEN="{token}"
```

(Hmm, this information probably belongs in CONTRIBUTING.md, doesn't it.)