fix spelling typo (#120062)

* fix spelling typo

* _index not nullable

This address the comment here: https://github.com/flutter/flutter/pull/120062#issuecomment-1421424676
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suragch 2023-02-22 07:16:23 +08:00 committed by GitHub
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@ -5385,8 +5385,8 @@ class _UndoStack<T> {
final List<T> _list = <T>[];
// The index of the current value, or null if the list is emtpy.
late int _index;
// The index of the current value, or -1 if the list is empty.
int _index = -1;
/// Returns the current value of the stack.
T? get currentValue => _list.isEmpty ? null : _list[_index];