[skip ci]Fix golint error for Init in QueryCoord (#11163)

Signed-off-by: cai.zhang <cai.zhang@zilliz.com>

internal/distributed/querycoord/client/client.go

@@ -129,6 +129,7 @@ func NewClient(ctx context.Context, metaRoot string, etcdEndpoints []string) (*C
 	return client, nil
 }
 
+// Init initializes QueryCoord's grpc client.
 func (c *Client) Init() error {
 	Params.Init()
 	return nil