docs(material/tree): delete tree-checklist example.

Delete tree-checklist example.

Author: zarend

src/components-examples/material/tree/index.ts

@@ -1,4 +1,3 @@
-export {TreeChecklistExample} from './tree-checklist/tree-checklist-example';
 export {TreeDynamicExample} from './tree-dynamic/tree-dynamic-example';
 export {TreeFlatOverviewExample} from './tree-flat-overview/tree-flat-overview-example';
 export {TreeHarnessExample} from './tree-harness/tree-harness-example';

src/components-examples/material/tree/tree-checklist/tree-checklist-example.css

@@ -15,10 +15,6 @@
     <mat-expansion-panel-header>CDK Nested tree</mat-expansion-panel-header>
     <cdk-tree-nested-example></cdk-tree-nested-example>
   </mat-expansion-panel>
-  <mat-expansion-panel>
-    <mat-expansion-panel-header>Todo list tree</mat-expansion-panel-header>
-    <tree-checklist-example></tree-checklist-example>
-  </mat-expansion-panel>
   <mat-expansion-panel>
     <mat-expansion-panel-header>Dynamic flat tree</mat-expansion-panel-header>
     <tree-dynamic-example></tree-dynamic-example>