modify doc to use int instead of float + remove trailing space

Author: antoineeripret

pandas_gbq/gbq.py

@@ -269,9 +269,9 @@ def read_gbq(
         If True, run a dry run query.
     Returns
     -------
-    df: DataFrame or float
+    df: DataFrame or int
         DataFrame representing results of query. If ``dry_run=True``, returns
-        a float representing the amount of data that would be processed (in bytes).
+        aan integer representing the amount of data that would be processed (in bytes).
     """
     if dialect is None:
         dialect = context.dialect

tests/unit/test_gbq.py

@@ -956,4 +956,4 @@ def test_read_gbq_with_dry_run(mock_bigquery_client, mock_query_job):
         _, kwargs = mock_bigquery_client.query.call_args
         job_config = kwargs["job_config"]
     assert job_config.dry_run is True
-    assert cost >= 0 
+    assert cost >= 0