doc: Suggest libFuzzer for MacOS users

[Prabhat1308]

hongfuzz is not actively maintained for MacOS users since the last update was for MacOS 13 which was 1.5 years in the past.

[ldk-reviews-bot]

I've assigned @wpaulino as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[tnull]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.22%. Comparing base (d671596) to head (b7fbe76).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3673      +/-   ##
==========================================
- Coverage   89.25%   89.22%   -0.03%     
==========================================
  Files         155      155              
  Lines      119911   119954      +43     
  Branches   119911   119954      +43     
==========================================
+ Hits       107022   107031       +9     
- Misses      10272    10294      +22     
- Partials     2617     2629      +12     

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