docs-bug(mat-tree): Examples still use deprecated symbols #31524
Description
Documentation Feedback
It'd be awesome to modernize the MatTree examples as they still mention deprecated parts. Should anyone choose to paste code into latest Angular, they'd face a lot of crossed out symbols, such as: FlatTreeControl, NestedTreeControl, MatTreeFlattener, MatTreeFlatDataSource.
It'd be good to also showcase some more advanced scenarios:
- editable/sortable tree
- tree with checkboxes
renderNodeChanges,activation(output)- displaying additional data as meta column (to the right-had side)