Document how to specify view permissions
Document how to specify view permissions

Example:

`pg_stat_database` is a view in `pg_catalog`.

```
datadog_grants:
  postgres_privileges.present:
    - name: datadog
    - prepend: pg_catalog
    - object_name: pg_stat_database
    - object_type: table
    - privileges:
      - SELECT
```

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt