Update the API docs to mention that when invoking TF2 summary implementation in TF1 APIs, it's possible to set step for the writer using `tf.compat.v1.train.create_global_step`.
Update the API docs to mention that when invoking TF2 summary implementation in TF1 APIs, it's possible to set step for the writer using `tf.compat.v1.train.create_global_step`.

PiperOrigin-RevId: 428768438
Change-Id: If1c8f54e26634a19921359d53fbf45d654a395b8

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