chore: remove broken default option

[erikian]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

This default value has been broken for a while, as @electron/get expects the rejectUnauthorized property inside the downloadOptions object, not as a top-level option. This PR is just updating the docs to reflect the current behavior.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (55eebc7) 91.80% compared to head (8f14277) 91.80%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1658   +/-   ##
=======================================
  Coverage   91.80%   91.80%           
=======================================
  Files          16       16           
  Lines         854      854           
  Branches      167      167           
=======================================
  Hits          784      784           
  Misses         52       52           
  Partials       18       18           

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[continuous-auth]

🎉 This PR is included in version 18.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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