Deprecation Guide for Deprecate import not from @ember/object/computed

not from @ember/object/computed is deprecated.

Before:

import { not } from '@ember/object/computed';
class State {
  isActive = true;
  @not('isActive') isInactive;
}

After:

class State {
  isActive = true;
  get isInactive() { return !this.isActive; }
}