docs: add further info about x86 conda MacOS issue

[Wheest]

Closes #731.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.46%. Comparing base (8772c07) to head (3e26b16).
⚠️ Report is 114 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #732      +/-   ##
===========================================
- Coverage    86.91%   78.46%   -8.45%     
===========================================
  Files           40       49       +9     
  Lines        25542    27135    +1593     
  Branches         0      843     +843     
===========================================
- Hits         22198    21289     -909     
- Misses        3344     5574    +2230     
- Partials         0      272     +272     

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