Add explicit documentation for each of the API functions in c_api_experimental.h that they are experimental APIs and subject to change.
Add explicit documentation for each of the API functions in
c_api_experimental.h that they are experimental APIs and subject
to change.

PiperOrigin-RevId: 334404623
Change-Id: I6944997f451e83c4735a0dbd0d12420d6b7c45ba

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