opts: fix formatting of comments

Comments should have a leading space unless the comment is
for special purposes (go:generate, nolint:)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

opts/port.go

@@ -160,7 +160,7 @@ func ConvertPortToPortConfig(
 
 		for i := startHostPort; i <= endHostPort; i++ {
 			ports = append(ports, swarm.PortConfig{
-				//TODO Name: ?
+				// TODO Name: ?
 				Protocol:      swarm.PortConfigProtocol(strings.ToLower(port.Proto())),
 				TargetPort:    uint32(port.Int()),
 				PublishedPort: uint32(i),