Comment more packages to pass go lint

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

protobuf/plugin/helpers.go

@@ -5,6 +5,7 @@ import (
 	"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
 )
 
+// FieldpathEnabled returns true if E_Fieldpath is enabled
 func FieldpathEnabled(file *descriptor.FileDescriptorProto, message *descriptor.DescriptorProto) bool {
 	return proto.GetBoolExtension(message.Options, E_Fieldpath, proto.GetBoolExtension(file.Options, E_FieldpathAll, false))
 }