[#270] client: Drop TODO about dial

Since `grpc.NewClient` method is now being used, a RPC call must be made
to actually establish the connection.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

client/client.go

@@ -98,7 +98,6 @@ func (c *Client) Dial(ctx context.Context, prm PrmDial) error {
 
 	c.setFrostFSAPIServer((*coreServer)(&c.c))
 
-	// TODO: (neofs-api-go#382) perform generic dial stage of the client.Client
 	_, err := rpc.Balance(&c.c, new(v2accounting.BalanceRequest),
 		client.WithContext(ctx),
 	)