docs(): update some classes to private

ionic/components/list/list.ts

@@ -110,6 +110,9 @@ export class List extends Ion {
 }
 
 
+/**
+ * @private
+ */
 @Directive({
   selector: 'ion-list-header',
   inputs: [

ionic/components/overlay/overlay.ts

@@ -7,6 +7,9 @@ import {OverlayController} from './overlay-controller';
 import {NavController} from '../nav/nav-controller';
 
 
+/**
+ * @private
+ */
 @Component({
   selector: 'ion-overlay',
   template: '<template #contents></template>'

ionic/components/toolbar/toolbar.ts

@@ -7,7 +7,7 @@ import {Navbar} from '../navbar/navbar';
 
 
 /**
- * TODO
+ * @private
  */
 export class ToolbarBase extends Ion  {
 

ionic/util/click-block.ts

@@ -3,7 +3,9 @@ const DEFAULT_EXPIRE = 330;
 let cbEle, fallbackTimerId;
 let isShowing = false;
 
-
+/**
+ * @private
+ */
 export class ClickBlock {
 
   enable() {