Update bigquery.py (#31620)

Fixed this rendering issue

sdks/python/apache_beam/io/gcp/bigquery.py

@@ -296,13 +296,12 @@ def chain_after(result):
        | MyOperationAfterWriteToBQ())
 
 Attributes can be accessed using dot notation or bracket notation:
-```
+
 result.failed_rows                  <--> result['FailedRows']
 result.failed_rows_with_errors      <--> result['FailedRowsWithErrors']
 result.destination_load_jobid_pairs <--> result['destination_load_jobid_pairs']
 result.destination_file_pairs       <--> result['destination_file_pairs']
 result.destination_copy_jobid_pairs <--> result['destination_copy_jobid_pairs']
-```
 
 Writing with Storage Write API using Cross Language
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