fix(header-link): remove title

- the aria-label is sufficient

Relates to #671.

Author: Splaktar

src/app/shared/doc-viewer/doc-viewer.ts

@@ -1,4 +1,4 @@
-import {ComponentPortal, DomPortalHost, DomPortalOutlet} from '@angular/cdk/portal';
+import {ComponentPortal, DomPortalOutlet} from '@angular/cdk/portal';
 import {HttpClient, HttpErrorResponse} from '@angular/common/http';
 import {DomSanitizer} from '@angular/platform-browser';
 import {
@@ -107,7 +107,7 @@ export class DocViewer implements OnDestroy {
 
     Array.prototype.slice.call(exampleElements).forEach((element: Element) => {
       const example = element.getAttribute(componentName);
-      const portalHost = new DomPortalHost(
+      const portalHost = new DomPortalOutlet(
           element, this._componentFactoryResolver, this._appRef, this._injector);
       const examplePortal = new ComponentPortal(componentClass, this._viewContainerRef);
       const exampleViewer = portalHost.attach(examplePortal);

src/app/shared/doc-viewer/header-link.ts

@@ -17,12 +17,8 @@ import {Router} from '@angular/router';
 @Component({
   selector: 'header-link',
   template: `
-    <a
-      title="Link to this heading"
-      aria-label="Link to this heading"
-      class="docs-markdown-a"
-      [attr.aria-describedby]="example"
-      [href]="_getFragmentUrl()">
+    <a aria-label="Link to this heading" class="docs-markdown-a"
+      [attr.aria-describedby]="example" [href]="_getFragmentUrl()">
       <mat-icon>link</mat-icon>
     </a>
   `