[doc] fix log_table parameter when using DataFrame

[tuliocasagrande]

Issue #, if available: Got the following error when trying to use my_tracker.log_table('SampleData', df):

ValueError: Table values should be list. i.e. {"x": [1,2,3]}, instead was <class 'pandas.core.series.Series'>

Description of changes: Changed documentation to my_tracker.log_table('SampleData', data_frame=df), passing the data_frame parameter correctly.

Testing done:

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[tuliocasagrande]

Just noticed SageMaker Experiments is now fully integrated with the SageMaker Python SDK: https://docs.aws.amazon.com/sagemaker/latest/dg/experiments-additional-sdk.html.