Added more comments

src/app/submission/server-submission.service.ts

@@ -6,21 +6,45 @@ import { SubmissionService } from './submission.service';
 import { SubmissionObject } from '../core/submission/models/submission-object.model';
 import { RemoteData } from '../core/data/remote-data';
 
+/**
+ * Instance of SubmissionService used on SSR.
+ */
 @Injectable()
 export class ServerSubmissionService extends SubmissionService {
 
+  /**
+   * Override createSubmission parent method to return an empty observable
+   *
+   * @return Observable<SubmissionObject>
+   *    observable of SubmissionObject
+   */
   createSubmission(): Observable<SubmissionObject> {
     return observableOf(null);
   }
 
+  /**
+   * Override retrieveSubmission parent method to return an empty observable
+   *
+   * @return Observable<SubmissionObject>
+   *    observable of SubmissionObject
+   */
   retrieveSubmission(submissionId): Observable<RemoteData<SubmissionObject>> {
     return observableOf(null);
   }
 
+  /**
+   * Override startAutoSave parent method and return without doing anything
+   *
+   * @param submissionId
+   *    The submission id
+   */
   startAutoSave(submissionId) {
     return;
   }
 
+  /**
+   * Override startAutoSave parent method and return without doing anything
+   */
   stopAutoSave() {
     return;
   }