[Jobs] Limit comments to 80 chars, remove omitempty as the field is required

Co-Authored-By: julienroland <roland.julien.perso@gmail.com>

jobs.go

@@ -178,23 +178,25 @@ func (s *JobsService) GetJobArtifacts(pid interface{}, jobID int, options ...Opt
 	return artifactsBuf, resp, err
 }
 
-// DownloadArtifactsFileOptions represents the available DownloadArtifactsFile() options.
+// DownloadArtifactsFileOptions represents the available DownloadArtifactsFile()
+// options.
 //
-// GitLab API docs: https://docs.gitlab.com/ce/api/jobs.html#download-the-artifacts-file
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/jobs.html#download-the-artifacts-file
 type DownloadArtifactsFileOptions struct {
-	Job *string `url:"job,omitempty" json:"job,omitempty"`
+	Job *string `url:"job" json:"job"`
 }
 
 // DownloadArtifactsFile download the artifacts file from the given
 // reference name and job provided the job finished successfully.
 //
-// GitLab API docs: https://docs.gitlab.com/ce/api/jobs.html#download-the-artifacts-file
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/jobs.html#download-the-artifacts-file
 func (s *JobsService) DownloadArtifactsFile(pid interface{}, refName string, opt *DownloadArtifactsFileOptions, options ...OptionFunc) (io.Reader, *Response, error) {
 	project, err := parseID(pid)
 	if err != nil {
 		return nil, nil, err
 	}
-
 	u := fmt.Sprintf("projects/%s/jobs/artifacts/%s/download", url.QueryEscape(project), refName)
 
 	req, err := s.client.NewRequest("GET", u, opt, options)