Fix typo in BigQuery Python Documentation (apache#34317)

Author: AaronTrelstad

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

@@ -238,7 +238,7 @@ def compute_table_name(row):
 
 Chaining of operations after WriteToBigQuery
 --------------------------------------------
-WritToBigQuery returns an object with several PCollections that consist of
+WriteToBigQuery returns an object with several PCollections that consist of
 metadata about the write operations. These are useful to inspect the write
 operation and follow with the results::