Update the link in ClassMockFinalClass.md to a place where the reasoning is actually given.
Update the link in ClassMockFinalClass.md to a place where the reasoning is actually given.

The current GitHub FAQ doesn't tell us anything about the details apart from mocking final classes is not possible with Mockito 1.x.

PiperOrigin-RevId: 490893617

google/error-prone,google/error-prone