update docstring formatting

Author: chalmerlowe

google/cloud/bigquery/external_config.py

@@ -505,10 +505,11 @@ def source_column_match(self) -> Optional[str]:
         autodetect is used, then columns are matched by name. Otherwise, columns
         are matched by position. This is done to keep the behavior
         backward-compatible.
+
         Acceptable values are:
-          POSITION - matches by position. This assumes that the columns are ordered
-              the same way as the schema.
-          NAME - matches by name. This reads the header row as column names and
+            POSITION - matches by position. This assumes that the columns are ordered
+                the same way as the schema.
+            NAME - matches by name. This reads the header row as column names and
               reorders columns to match the field names in the schema.
 
         See

google/cloud/bigquery/job/load.py

@@ -648,11 +648,12 @@ def source_column_match(self) -> Optional[SourceColumnMatch]:
         loaded columns to the schema. If not set, a sensible default is chosen based on how the schema
         is provided. If autodetect is used, then columns are matched by name. Otherwise, columns
         are matched by position. This is done to keep the behavior backward-compatible.
+
         Acceptable values are:
-          POSITION - matches by position. This assumes that the columns are ordered
-              the same way as the schema.
-          NAME - matches by name. This reads the header row as column names and
-              reorders columns to match the field names in the schema.
+            POSITION - matches by position. This assumes that the columns are ordered
+                the same way as the schema.
+            NAME - matches by name. This reads the header row as column names and
+                reorders columns to match the field names in the schema.
 
         See:
         https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobConfigurationLoad.FIELDS.source_column_match