Update the docstring for Bidirectional wrapper wrt to the layer used.
Update the docstring for Bidirectional wrapper wrt to the layer used.

For any custom layer to work with Bidirectional wrapper, the layer need to support "go_backwards" as its init parameter and property.

PiperOrigin-RevId: 293904336
Change-Id: Id65eff898e3acc6d33897f4671c042167f178958

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