docs(python): Mention row_by_keys in the to_dict documentation

[gab23r]

User coming from pandas will try to get the equivalent of df.set_index([key1, key2]).to_dict() but can easily miss row_by_keys. I think adding row_by_keys in the "see also" section of to_dict is a good addition

[codecov]

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+ Misses      43048    43033   -15     
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[alexander-beedie]

Looks like a good addition - while you're at it, could you also add to_dicts to the same "See Also", and then add to_dict to the rows_by_key "See Also" so it goes both ways? :)