Merge #17942: doc: Improve fuzzing docs for macOS users

b6c3e84e87055be311347d7b636d68a6a828f563 doc: Improve fuzzing docs for macOS users (Fabian Jahr)

Pull request description:

  Adds several helpful hints for macOS users trying to get fuzzers to run locally using AFL or libFuzzer. These are partly based on this comment https://github.com/bitcoin/bitcoin/issues/17657#issuecomment-562869600 and discussions in the review club for #17860. See: https://bitcoincore.reviews/17860.html

  Based on the doc in the current state I could not compile fuzzers for AFL or libFuzzer. Using these hints, I can
  - compile and run fuzzers with AFL
  - compile but **not** run fuzzers with libFuzzer

  Fuzzers compiled with libFuzzers may be running but don't produce any output. Looking for others to test this to see if it is an issue with my local system. Especially interesting if you have been running libFuzzer fuzzers successfully on macOS before.

  Edit: Closes #17914

ACKs for top commit:
  MarcoFalke:
    ACK b6c3e84e87055be311347d7b636d68a6a828f563
  Sjors:
    ACK b6c3e84
  fanquake:
    ACK b6c3e84e87055be311347d7b636d68a6a828f563 - I think this has been nitpicked enough, and importantly the commands look better now.

Tree-SHA512: fdbacbcf10e9353a4ac3d22edf88663e33185ad2f244b986ff74c513de05f9fa62c4d8b17985d2f9288834c124b352cf52280627b5ff095735b411b12482e2ec

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