Replaced broken link with official Tensorflow documentation
Replaced broken link with official Tensorflow documentation

The code for the old 'BigQuery to Tensorflow' python file has moved to https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/cloud/python/ops/bigquery_reader_ops.py (the old link was broken), but now an official documentation page for this package exists: https://www.tensorflow.org/api_docs/python/tf/contrib/cloud/BigQueryReader

The official documentation is probably a better starting point for a beginner than the module code.
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