doc: fix typo HF_MAX_IN_MEMORY_DATASET_SIZE_IN_BYTES
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{'url': 'https://api.github.com/repos/huggingface/datasets/pulls/2421', 'html_url': 'https://github.com/huggingface/datasets/pull/2421', 'diff_url': 'https://github.com/huggingface/datasets/pull/2421.diff', 'patch_url': 'https://github.com/huggingface/datasets/pull/2421.patch', 'merged_at': datetime.datetime(2021, 6, 4, 9, 52, 45)}
MAX_MEMORY_DATASET_SIZE_IN_BYTES should be HF_MAX_MEMORY_DATASET_SIZE_IN_BYTES
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