Make sure examples in bigquery-usage are up to date.

For example, there is a string

``` python
results = client.run_sync_query(query, timeout_ms=1000)
```

but `run_sync_query` [does not have](https://github.com/GoogleCloudPlatform/gcloud-python/blob/13f8693d6bd135ec4a9e6289ce46f2e89bc185fc/gcloud/bigquery/client.py#L173) `timeout_ms` as an optional argument.
