docs: correct docs for LoadJobConfig.destination_table_description (#810)

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Author: mgorsk1

google/cloud/bigquery/job/load.py

@@ -170,7 +170,7 @@ def destination_encryption_configuration(self, value):
 
  @property
  def destination_table_description(self):
- """Optional[str]: Name given to destination table.
+ """Optional[str]: Description of the destination table.
 
  See:
  https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#DestinationTableProperties.FIELDS.description