chore: update table examples (#11112)

src/material-examples/table-basic-flex/table-basic-flex-example.css

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+table {
+  width: 100%;
+}

src/material-examples/table-basic-flex/table-basic-flex-example.html

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+<table mat-table [dataSource]="dataSource" class="mat-elevation-z8">
+  <!-- Position Column -->
+  <ng-container matColumnDef="position">
+    <th mat-header-cell *matHeaderCellDef> No. </th>
+    <td mat-cell *matCellDef="let element"> {{element.position}} </td>
+  </ng-container>
+
+  <!-- Name Column -->
+  <ng-container matColumnDef="name">
+    <th mat-header-cell *matHeaderCellDef> Name </th>
+    <td mat-cell *matCellDef="let element"> {{element.name}} </td>
+  </ng-container>
+
+  <!-- Weight Column -->
+  <ng-container matColumnDef="weight">
+    <th mat-header-cell *matHeaderCellDef> Weight </th>
+    <td mat-cell *matCellDef="let element"> {{element.weight}} </td>
+  </ng-container>
+
+  <!-- Symbol Column -->
+  <ng-container matColumnDef="symbol">
+    <th mat-header-cell *matHeaderCellDef> Symbol </th>
+    <td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
+  </ng-container>
+
+  <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
+  <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
+</table>

src/material-examples/table-basic-flex/table-basic-flex-example.ts

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+import {Component} from '@angular/core';
+
+/**
+ * @title Basic use of `<mat-table>` (uses display flex)
+ */
+@Component({
+  selector: 'table-basic-flex-example',
+  styleUrls: ['table-basic-flex-example.css'],
+  templateUrl: 'table-basic-flex-example.html',
+})
+export class TableBasicFlexExample {
+  displayedColumns = ['position', 'name', 'weight', 'symbol'];
+  dataSource = ELEMENT_DATA;
+}
+
+export interface PeriodicElement {
+  name: string;
+  position: number;
+  weight: number;
+  symbol: string;
+}
+
+const ELEMENT_DATA: PeriodicElement[] = [
+  {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
+  {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
+  {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
+  {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
+  {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
+  {position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
+  {position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
+  {position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
+  {position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
+  {position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
+];