docs: update curl flag for macos portfile installation

[zanechua]

Description

Curl command needs to follow the redirect otherwise you'll get a 0-byte file

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.10%. Comparing base (991fab9) to head (357e9d0).

Additional details and impacted files

@@            Coverage Diff             @@
##           nightly   #2337      +/-   ##
==========================================
- Coverage     6.11%   6.10%   -0.01%     
==========================================
  Files           85      85              
  Lines        18303   18303              
  Branches      8319    8319              
==========================================
- Hits          1119    1118       -1     
- Misses       15375   15688     +313     
+ Partials      1809    1497     -312     

Flag	Coverage Δ
Linux	4.11% <ø> (ø)
Windows	1.51% <ø> (ø)
macOS-12	8.13% <ø> (-0.13%)	⬇️
macOS-13	7.46% <ø> (+0.05%)	⬆️
macOS-14	7.72% <ø> (ø)

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see 22 files with indirect coverage changes