Fix deprecated warning message and docstring
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['I have a question: what about `dictionary_encode_column_`?\r\n- It is deprecated in Dataset, but it recommends using a non-existing method instead: `Dataset.dictionary_encode_column` does not exist.\r\n- It is NOT deprecated in DatasetDict.'
 "`dictionary_encode_column_ ` should be deprecated since it never worked correctly. It will be removed in a major release.\r\nThis has to be deprecated in `DatasetDict` as well.\r\nAnd `Dataset.dictionary_encode_column` doesn't exist indeed."
 'Thanks @lhoestq. I have fixed deprecated for `dictionary_encode_column_`.']
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Fix deprecated warnings:
- Use deprecated Sphinx directive in docstring
- Fix format of deprecated message
- Raise FutureWarning
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