Tweak, add some examples and comparisons with alternatives to the docstring for tf.nn.sigmoid_cross_entropy_with_logits.
Tweak, add some examples and comparisons with alternatives to the docstring for tf.nn.sigmoid_cross_entropy_with_logits.

I've seen some confusion about the wording, which previously made it seem like this symbol was not appropriate for binary classification with mutually exclusive classes.

PiperOrigin-RevId: 363897491
Change-Id: I8b65b6a225320c12e4dee6fb3ef1e2ed0e8a6a02

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