Clarify why we have *-gpu package. Fix https://github.com/tensorflow/tensorflow/issues/39581
Clarify why we have *-gpu package.
Fix https://github.com/tensorflow/tensorflow/issues/39581

PiperOrigin-RevId: 311782903
Change-Id: If002f2d2b112012e1c75e0c16f7a922546a9bba5

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