Fix typo in multimodal_datasets.rst

[krammnic]

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#1786

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[krammnic]

@RdoubleA You can merge(typo fix)

[RdoubleA]

there's a line below that still uses transform:

print(transform.decode(tokenized_dict["tokens"], skip_special_tokens=False))

[krammnic]

Fixed this line, thank you!