text: Title: invalid import in version 3.0.0 docs
  Body: On the [filtering events](https://docs.aiogram.dev/en/dev-3.x/dispatcher/filters/index.html#) page, on writing bound filters, the sample code section, wrong import is inserted:
  `from aiogram.filters import BaseFilter`
  it has to be : 
  `from aiogram.dispatcher.filters import BaseFilter`
  
  