fix for lint test failure

pkg/imgpkg/plainimage/contents.go

@@ -29,6 +29,8 @@ type ImagesWriter interface {
 	WriteTag(ref regname.Tag, taggagle regremote.Taggable) error
 }
 
+// NewContents constructor to build a plainimage contents responsible for creating and pushing images,
+// by setting displayProgress to 'true' printing out a progress bar using updates when writing to a registry via ggcr
 func NewContents(paths []string, excludedPaths []string, displayProgress bool) Contents {
 	return Contents{paths: paths, excludedPaths: excludedPaths, displayProgress: displayProgress}
 }