docs(chips): Added stylesUrls to reference css. (#6620)

Author: Jefiozie

src/material-examples/chips-overview/chips-overview-example.ts

@@ -6,5 +6,6 @@ import {Component} from '@angular/core';
 @Component({
   selector: 'chips-overview-example',
   templateUrl: 'chips-overview-example.html',
+  styleUrls: ['chips-overview-example.css'],
 })
 export class ChipsOverviewExample {}