refactor: ensure all 'TODO's are consistent (#23252)

PR Close #23252

aio/src/app/custom-elements/api/api-list.component.ts

@@ -78,7 +78,7 @@ export class ApiListComponent implements OnInit {
     this.initializeSearchCriteria();
   }
 
-  // Todo: may need to debounce as the original did
+  // TODO: may need to debounce as the original did
   // although there shouldn't be any perf consequences if we don't
   setQuery(query: string) {
     this.setSearchCriteria({query: (query || '').toLowerCase().trim() });

aio/src/app/custom-elements/api/api.service.ts

@@ -75,7 +75,7 @@ export class ApiService implements OnDestroy {
       .subscribe(
         sections => this.sectionsSubject.next(sections),
         (err: HttpErrorResponse) => {
-          // Todo: handle error
+          // TODO: handle error
           this.logger.error(err);
           throw err; // rethrow for now.
         }