style: remove empty comments (#23404)

PR Close #23404

packages/common/http/src/client.ts

@@ -42,9 +42,6 @@ function addBody<T>(
   };
 }
 
-/**
- *
- */
 export type HttpObserve = 'body' | 'events' | 'response';
 
 /**

packages/common/src/directives/ng_for_of.ts

@@ -8,9 +8,6 @@
 
 import {ChangeDetectorRef, Directive, DoCheck, EmbeddedViewRef, Input, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDiffers, NgIterable, OnChanges, SimpleChanges, TemplateRef, TrackByFunction, ViewContainerRef, forwardRef, isDevMode} from '@angular/core';
 
-/**
- *
- */
 export class NgForOfContext<T> {
   constructor(
       public $implicit: T, public ngForOf: NgIterable<T>, public index: number,

packages/common/src/directives/ng_if.ts

@@ -158,9 +158,6 @@ export class NgIf {
   public static ngIfUseIfTypeGuard: void;
 }
 
-/**
- *
- */
 export class NgIfContext {
   public $implicit: any = null;
   public ngIf: any = null;

packages/common/src/version.ts

@@ -13,7 +13,5 @@
  */
 
 import {Version} from '@angular/core';
-/**
- *
- */
+
 export const VERSION = new Version('0.0.0-PLACEHOLDER');