Documentation for enums is missing

[parthea]

See the enum for PartitionKey in the golden file below.

gapic-generator-python/tests/integration/goldens/asset/google/cloud/asset_v1/types/asset_service.py

Lines 746 to 755 in 6cc95de

	class PartitionKey(proto.Enum):
	r"""This enum is used to determine the partition key column when
	exporting assets to BigQuery partitioned table(s). Note that, if the
	partition key is a timestamp column, the actual partition is based
	on its date value (expressed in UTC. see details in
	https://cloud.google.com/bigquery/docs/partitioned-tables#date_timestamp_partitioned_tables).
	"""
	PARTITION_KEY_UNSPECIFIED = 0
	READ_TIME = 1
	REQUEST_TIME = 2

The documentation for enums PARTITION_KEY_UNSPECIFIED, READ_TIME and REQUEST_TIME appear in the proto file but not in the generated code.

  enum PartitionKey {
    // Unspecified partition key. If used, it means using non-partitioned table.
    PARTITION_KEY_UNSPECIFIED = 0;

    // The time when the snapshot is taken. If specified as partition key, the
    // result table(s) is partitoned by the additional timestamp column,
    // readTime. If [read_time] in ExportAssetsRequest is specified, the
    // readTime column's value will be the same as it. Otherwise, its value will
    // be the current time that is used to take the snapshot.
    READ_TIME = 1;

    // The time when the request is received and started to be processed. If
    // specified as partition key, the result table(s) is partitoned by the
    // requestTime column, an additional timestamp column representing when the
    // request was received.
    REQUEST_TIME = 2;
  }