Add migration docstring to `initializers/initializers_v2:ones`.  Ones takes no arguments and has no changed behavior.
Add migration docstring to `initializers/initializers_v2:ones`.  Ones takes no arguments and has no changed behavior.

PiperOrigin-RevId: 388192132
Change-Id: I78dc45f5564541a886137e3df033fa11c70210d4

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