docs(readme): update onnx example import path and cache location (#2607)

Jeffrey Guan

2025-07-23 8316fc41973b89267a70681a7afe4e947e0ba251

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from fun_text_processing.text_normalization.en.taggers.tokenize_and_classify import ClassifyFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize import VerbalizeFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize_final import VerbalizeFinalFst