tree: importing MatIconModule and MatButtonModule is necessary

It would be helpful to mention in the API reference for Angular Material tree that besides the MatTreeModule also MatIconModule and MatButtonModule must be imported into the app.module.ts. (eg. when you use a “Tree with flat nodes”)

import {MatButtonModule} from '@angular/material/button';
import {MatIconModule} from '@angular/material/icon';
import {MatTreeModule} from '@angular/material/tree';

[romualdnave]

@crisbeto Considering most of the components usage examples are using mat-icon-button directive or <mat-icon> selector would this still be relevant (another example being the Menu component) ? Should some kind of global mention to these necessary imports be considered in the documentation then ?

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