add some more comments for the dir param that used by ModelCheckpoint, BackupAndRestore, TensorBoard callbacks that ask end user to use separate directories for different callbacks. This is to guide user with correct usage.
add some more comments for the dir param that used by ModelCheckpoint, BackupAndRestore, TensorBoard callbacks that ask end user to use separate directories for different callbacks.
This is to guide user with correct usage.

PiperOrigin-RevId: 345737485
Change-Id: Ic4029f4aa24156861cbdc062abf2a17d602d925a

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