Missing docs for TensorFlowProcessor

[ksonbol]

What did you find confusing? Please describe.
I did not find any documentation on the TensorFlowProcessor while docs exist for SKLearn and Spark Processors. Was it left out on purpose? Are there any stability issues I should be concerned about when using the TensorFlowProcessor?

Describe how documentation can be improved
API docs and possibly a tutorial could be added to the docs about using the TensorFlowProcessor. A warning could be added if it is not officially supported yet.

Additional context
I'd like to use the TensorFlowProcessor for creating TF Records as part of a data preparation/processing step.

[ksonbol]

I found this is already mentioned in this description of this PR

[svpino]

It would be nice to have documentation for this class.

[martinRenou]

Thank you for opening an issue.

There is a bit of documentation here (at least, a small usage example) https://docs.aws.amazon.com/sagemaker/latest/dg/processing-job-frameworks-tensorflow.html. But it's true that the API documentation is missing.

[martinRenou]

This has been fixed by #4152