overflow: Adjust check_*_overflow() kern-doc to reflect results

The check_*_overflow() helpers will return results with potentially
wrapped-around values. These values have always been checked by the
selftests, so avoid the confusing language in the kern-doc. The idea of
"safe for use" was relative to the expectation of whether or not the
caller wants a wrapped value -- the calculation itself will always follow
arithmetic wrapping rules.

Reviewed-by: Gustavo A. R. Silva <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Signed-off-by: Kees Cook <[email protected]>

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