

TITLE
overflow_to_sample_mapping missing in in documentation

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In the [documentation ]( https://huggingface.co/transformers/master/main_classes/tokenizer.html#transformers.PreTrainedTokenizerFast.__call__)of the fast tokenizer, the `overflow_to_sample_mapping` field is missing.
Instead the `overflowing_tokens`  is listed there, which is only part of  the base tokenizer.
