Improve documentation for TFRecordDataset.
Improve documentation for TFRecordDataset.

This adds a longer description and includes the example used for TFRecordWriter (https://www.tensorflow.org/api_docs/python/tf/io/TFRecordWriter)

PiperOrigin-RevId: 363734980
Change-Id: I97e616bbcabae0e64b016d34bfbdba6996bd9ebc

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