[skip ci]Fix golint error in datacoord (#11351)

Signed-off-by: Nzhenshan.cao <zhenshan.cao@zilliz.com>

internal/distributed/datacoord/client/client.go

@@ -238,6 +238,7 @@ func (c *Client) GetComponentStates(ctx context.Context) (*internalpb.ComponentS
 	return ret.(*internalpb.ComponentStates), err
 }
 
+// GetTimeTickChannel return the name of time tick channel.
 func (c *Client) GetTimeTickChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
 	ret, err := c.recall(func() (interface{}, error) {
 		client, err := c.getGrpcClient()
@@ -253,6 +254,7 @@ func (c *Client) GetTimeTickChannel(ctx context.Context) (*milvuspb.StringRespon
 	return ret.(*milvuspb.StringResponse), err
 }
 
+// GetStatisticsChannel return the name of statistics channel.
 func (c *Client) GetStatisticsChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
 	ret, err := c.recall(func() (interface{}, error) {
 		client, err := c.getGrpcClient()