Adadelta use case clarification. Contributed from https://github.com/tensorflow/tensorflow/pull/36849 by 	abhilash1910
Adadelta use case clarification.
Contributed from https://github.com/tensorflow/tensorflow/pull/36849 by 	abhilash1910

PiperOrigin-RevId: 305288812
Change-Id: I710013945f0cd38db0f19247584a74b2fd35e0e5

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