Update bigquery-configs.md (#5103)

In the current document, the logs/dbt.log has a typo, and the source and
destination for the copy use the same table.

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website/docs/reference/resource-configs/bigquery-configs.md

@@ -633,7 +633,7 @@ from {{ ref('events') }}
 
 ```
 ...
-[0m16:03:13.017641 [debug] [Thread-3 (]: BigQuery adapter: Copying table(s) "/projects/projectname/datasets/analytics/tables/bigquery_table$20230112" to "/projects/projectname/datasets/analytics/tables/bigquery_table$20230112" with disposition: "WRITE_TRUNCATE"
+[0m16:03:13.017641 [debug] [Thread-3 (]: BigQuery adapter: Copying table(s) "/projects/projectname/datasets/analytics/tables/bigquery_table__dbt_tmp$20230112" to "/projects/projectname/datasets/analytics/tables/bigquery_table$20230112" with disposition: "WRITE_TRUNCATE"
 ...
 ```