I get your point, @huseyinyilmaz01. I am not saying that you have to enter all possible missspellings. Some mistakes are quite common, and if you use the CountVectorsFeaturizer with an n-gram setting, then your pipeline can pay attention to parts of words, which might help.
The problem with spell-correction is that the auto-correction might be wrong. Perhaps you could get around this if you forwarded both the original, as well as the auto-corrected text to the featurizers… In any case, what I’ve heard is that using the count vectors is better than spell correction. Might depend on the language though.
I’ll get back to you if I can find a spell checker that you can use with Rasa 2.