Improve documentation to discourage non-zero returncodes #12955
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This PR adds a small documentation change to discourage the use of non-zero return values.
Based on this issue #11983, Honggfuzz does not support other return values, while libFuzzer, in my opinion unexpectedly, discards inputs for return values other than zero which can cause creation of faulty harnesses. As a result I think it is fair to discourage all uses of non-zero return values from LLVMFuzzerTestOneInput.