Fix docs in scaii_defs to not fail doctest.
Fix docs in scaii_defs to not fail doctest.

Add `text` to each code block documenting the require
`#[no_mangle]` functions in the trait definitions for in `scaii_defs`.

Earlier it was giving spurious errors about failing doctests.

SCAII/SCAII,SCAII/SCAII,SCAII/SCAII,SCAII/SCAII,SCAII/SCAII