docs(tabs): make non-exported comps as docs private (#3510)

Author: andrewseguin

src/lib/tabs/index.ts

@@ -18,9 +18,26 @@ import {SCROLL_DISPATCHER_PROVIDER} from '../core/overlay/scroll/scroll-dispatch
 @NgModule({
   imports: [CommonModule, PortalModule, MdRippleModule, ObserveContentModule],
   // Don't export all components because some are only to be used internally.
-  exports: [MdTabGroup, MdTabLabel, MdTab, MdTabNavBar, MdTabLink, MdTabLinkRipple],
-  declarations: [MdTabGroup, MdTabLabel, MdTab, MdInkBar, MdTabLabelWrapper,
-    MdTabNavBar, MdTabLink, MdTabBody, MdTabLinkRipple, MdTabHeader],
+  exports: [
+    MdTabGroup,
+    MdTabLabel,
+    MdTab,
+    MdTabNavBar,
+    MdTabLink,
+    MdTabLinkRipple
+  ],
+  declarations: [
+    MdTabGroup,
+    MdTabLabel,
+    MdTab,
+    MdInkBar,
+    MdTabLabelWrapper,
+    MdTabNavBar,
+    MdTabLink,
+    MdTabBody,
+    MdTabLinkRipple,
+    MdTabHeader
+  ],
   providers: [VIEWPORT_RULER_PROVIDER, SCROLL_DISPATCHER_PROVIDER],
 })
 export class MdTabsModule {

src/lib/tabs/ink-bar.ts

@@ -1,7 +1,10 @@
 import {Directive, Renderer, ElementRef} from '@angular/core';
 
 
-/** The ink-bar is used to display and animate the line underneath the current active tab label. */
+/**
+ * The ink-bar is used to display and animate the line underneath the current active tab label.
+ * @docs-private
+ */
 @Directive({
   selector: 'md-ink-bar, mat-ink-bar',
   host: {

src/lib/tabs/tab-body.ts

@@ -43,6 +43,7 @@ export type MdTabBodyOriginState = 'left' | 'right';
 
 /**
  * Wrapper for the contents of a tab.
+ * @docs-private
  */
 @Component({
   moduleId: module.id,

src/lib/tabs/tab-header.ts

@@ -37,6 +37,7 @@ const EXAGGERATED_OVERSCROLL = 60;
  * an ink bar that follows the currently selected tab. When the tabs list's width exceeds the
  * width of the header container, then arrows will be displayed to allow the user to scroll
  * left and right across the header.
+ * @docs-private
  */
 @Component({
   moduleId: module.id,

src/lib/tabs/tab-label-wrapper.ts

@@ -2,7 +2,10 @@ import {Directive, ElementRef, Renderer, Input} from '@angular/core';
 import {coerceBooleanProperty} from '../core/coercion/boolean-property';
 
 
-/** Used in the `md-tab-group` view to display tab labels */
+/**
+ * Used in the `md-tab-group` view to display tab labels.
+ * @docs-private
+ */
 @Directive({
   selector: '[md-tab-label-wrapper], [mat-tab-label-wrapper]',
   host: {