fix docs folder

yhliang

2023-04-12 730b6ff249e0c9026a6b6233b8ab3ea6fab86384

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from fun_text_processing.inverse_text_normalization.id.taggers.tokenize_and_classify import ClassifyFst
from fun_text_processing.inverse_text_normalization.id.verbalizers.verbalize import VerbalizeFst
from fun_text_processing.inverse_text_normalization.id.verbalizers.verbalize_final import VerbalizeFinalFst