Docstring link fix
Docstring link fix

Current https://groups.google.com/a/tensorflow.org/g/build/c/SsW98Eo7l3o link in docstring is broken, https://groups.google.com/a/tensorflow.org/d/topic/build/SsW98Eo7l3o/discussion works better.

Originally added by https://github.com/tensorflow/tensorflow/commit/6d7c376df81efecef9ef69ff865b5ae02ad4ab59
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