BigQuery Snippets: Use autodetected location (#8340)

* b/116968956

Remove location since it is now auto-detected.

* Update snippets.py

Author: grant

bigquery/docs/snippets.py

@@ -983,12 +983,7 @@ def test_load_table_from_file(client, to_delete):
     job_config.autodetect = True
 
     with open(filename, "rb") as source_file:
-        job = client.load_table_from_file(
-            source_file,
-            table_ref,
-            location="US",  # Must match the destination dataset location.
-            job_config=job_config,
-        )  # API request
+        job = client.load_table_from_file(source_file, table_ref, job_config=job_config)
 
     job.result()  # Waits for table load to complete.