models/repo: idiomatic English (#5678)

* Idiomatic English

* Even better English

models/repo.go

@@ -1924,7 +1924,7 @@ func GitFsck() {
 			repo := bean.(*Repository)
 			repoPath := repo.RepoPath()
 			if err := git.Fsck(repoPath, setting.Cron.RepoHealthCheck.Timeout, setting.Cron.RepoHealthCheck.Args...); err != nil {
-				desc := fmt.Sprintf("Fail to health check repository '%s': %v", repoPath, err)
+				desc := fmt.Sprintf("Failed to perform health check on repository '%s': %v", repoPath, err)
 				log.Warn(desc)
 				if err = CreateRepositoryNotice(desc); err != nil {
 					log.Error(3, "CreateRepositoryNotice: %v", err)