Update a knowledge document

{
  "character_count": 0,
  "created_at": "2019-08-24T14:15:22Z",
  "error_message": "string",
  "file_name": "string",
  "file_size_bytes": 0,
  "id": "string",
  "is_enabled": true,
  "last_checked_at": "2019-08-24T14:15:22Z",
  "last_synced_at": "2019-08-24T14:15:22Z",
  "name": "string",
  "next_refresh_at": "2019-08-24T14:15:22Z",
  "object": "knowledge_document",
  "refresh_error_message": "string",
  "refresh_interval_hours": 0,
  "refresh_status": "idle",
  "source_type": "file",
  "source_url": "http://example.com",
  "status": "processing",
  "updated_at": "2019-08-24T14:15:22Z"
}

{
  "message": "limit must be an integer between 1 and 100.",
  "name": "bad_request"
}

{
  "message": "The supplied API key is invalid or revoked.",
  "name": "unauthorized"
}

{
  "message": "This API key does not have the required knowledge:write permission.",
  "name": "insufficient_scope"
}

{
  "message": "The requested resource was not found.",
  "name": "not_found"
}

{
  "message": "Too many requests. Please try again later.",
  "name": "rate_limited"
}

{
  "message": "Internal server error.",
  "name": "internal_server_error"
}

{
  "message": "The API is temporarily unavailable.",
  "name": "service_unavailable"
}